485BPOS

As filed with the Securities and Exchange Commission on September 9, 2011

Securities Act File No. 002-80150

Investment Company Act File No. 811-03595

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM N-1A

REGISTRATION STATEMENT

UNDER
THE SECURITIES ACT OF 1933	x
Pre-Effective Amendment No.	¨
Post-Effective Amendment No. 37	x
and/or
REGISTRATION STATEMENT
UNDER
THE INVESTMENT COMPANY ACT OF 1940	x
Amendment No. 38	x

(Check appropriate box or boxes)

BLACKROCK HEALTHCARE FUND, INC.

(Exact Name of Registrant as Specified in Charter)

100 Bellevue Parkway

Wilmington, Delaware 19809

(Address of Principal Executive Office)

Registrant’s Telephone Number, including Area Code (800) 441-7762

John M. Perlowski

BlackRock Healthcare Fund, Inc.

55 East 52^nd Street

New York, New York 10055

United States of America

(Name and Address of Agent for Service)

Copies to:

Frank P. Bruno, Esq.	Ira P. Shapiro, Esq.
Sidley Austin LLP	BlackRock Advisors, LLC
787 Seventh Avenue	55 East 52nd Street
New York, New York 10019-6018	New York, New York 10055

It is proposed that this filing will become effective (check appropriate box)

x Immediately upon filing pursuant to paragraph (b)

¨ On (date) pursuant to paragraph (b)

¨ 60 days after filing pursuant to paragraph (a)(1)

¨ On (date) pursuant to paragraph (a)(1)

¨ 75 days after filing pursuant to paragraph (a)(2)

¨ On (date) pursuant to paragraph (a)(2) of Rule 485.

If appropriate, check the following box:

¨ This post-effective amendment designates a new effective date for a previously filed post-effective amendment.

Title of Securities Being Registered: Shares of beneficial interest, par value $.001 per share.

SIGNATURES

Pursuant to the requirements of the Securities Act of 1933 and the Investment Company Act of 1940, the Registrant certifies that it meets all of the requirements for effectiveness of this Post-Effective Amendment to the Registration Statement pursuant to Rule 485(b) under the Securities Act and has duly caused this Registration Statement to be signed on its behalf by the undersigned, duly authorized, in the City of New York and the State of New York, on September 9, 2011.

BLACKROCK HEALTHCARE FUND, INC.
By	/S/    JOHN M. PERLOWSKI
	John M. Perlowski President and Chief Executive Officer

Pursuant to the requirements of the Securities Act of 1933, this Post-Effective Amendment to its Registration Statement has been signed below by the following persons in the capacities and on the dates indicated.

Signature		Title	Date
/S/    JOHN M. PERLOWSKI         John M. Perlowski		President and Chief Executive Officer (Principal Executive Officer)	September 9, 2011
/S/    NEAL J. ANDREWS         Neal J. Andrews		Chief Financial Officer (Principal Financial and Accounting Officer)	September 9, 2011
DAVID O. BEIM* David O. Beim		Director
RONALD W. FORBES* Ronald W. Forbes		Director
DR. MATINA S. HORNER* Dr. Matina S. Horner		Director
RODNEY D. JOHNSON* Rodney D. Johnson		Director
HERBERT I. LONDON* Herbert I. London		Director
CYNTHIA A. MONTGOMERY* Cynthia A. Montgomery		Director
JOSEPH P. PLATT* Joseph P. Platt		Director
ROBERT C. ROBB, JR.* Robert C. Robb, Jr.		Director
TOBY ROSENBLATT* Toby Rosenblatt		Director
KENNETH L. URISH* Kenneth L. Urish		Director
FREDERICK W. WINTER* Frederick W. Winter		Director
RICHARD S. DAVIS* Richard S. Davis		Director
HENRY GABBAY* Henry Gabbay		Director
*By:	/S/    BEN ARCHIBALD         Ben Archibald (Attorney-in-Fact)		September 9, 2011

2

EXHIBIT INDEX

Index No.	Description of Exhibit
EX-101.INS	XBRL Instance Document
EX-101.SCH	XBRL Taxonomy Extension Schema Document
EX-101.CAL	XBRL Taxonomy Extension Calculation Linkbase
EX-101.DEF	XBRL Taxonomy Extension Definition Linkbase
EX-101.LAB	XBRL Taxonomy Extension Labels Linkbase
EX-101.PRE	XBRL Taxonomy Extension Presentation Linkbase

3

XML



Label	Element	Value
Risk/Return:	rr_RiskReturnAbstract
Document Type	dei_DocumentType	485BPOS
Document Period End Date	dei_DocumentPeriodEndDate	Apr. 30, 2011
Registrant Name	dei_EntityRegistrantName	BLACKROCK HEALTHCARE FUND, INC.
Central Index Key	dei_EntityCentralIndexKey	0000709140
Amendment Flag	dei_AmendmentFlag	false
Document Creation Date	dei_DocumentCreationDate	Aug. 26, 2011
Document Effective Date	dei_DocumentEffectiveDate	Aug. 29, 2011
Prospectus Date	rr_ProspectusDate	Aug. 29, 2011

XML



Label

Element

Value

Risk/Return:

rr_RiskReturnAbstract

Registrant Name

dei_EntityRegistrantName

BLACKROCK HEALTHCARE FUND, INC.

Prospectus Date

rr_ProspectusDate

Aug. 29, 2011

BLACKROCK HEALTHCARE FUND, INC. | Investor A Shares

Risk/Return:

rr_RiskReturnAbstract

Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price)

rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice

5.25%

Maximum Deferred Sales Charge (Load) (as a percentage of offering price or redemption proceeds, whichever is lower)

rr_MaximumDeferredSalesChargeOverOther

none

^[1]

Management Fee

rr_ManagementFeesOverAssets

1.00%

Distribution and/or Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

0.25%

Other Expenses

rr_OtherExpensesOverAssets

0.33%

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

1.58%

1 Year

rr_ExpenseExampleYear01

677

3 Years

rr_ExpenseExampleYear03

998

5 Years

rr_ExpenseExampleYear05

1,340

10 Years

rr_ExpenseExampleYear10

2,305

Annual Return 2001

rr_AnnualReturn2001

(2.30%)

Annual Return 2002

rr_AnnualReturn2002

(22.36%)

Annual Return 2003

rr_AnnualReturn2003

22.00%

Annual Return 2004

rr_AnnualReturn2004

10.25%

Annual Return 2005

rr_AnnualReturn2005

14.20%

Annual Return 2006

rr_AnnualReturn2006

0.38%

Annual Return 2007

rr_AnnualReturn2007

18.90%

Annual Return 2008

rr_AnnualReturn2008

(26.29%)

Annual Return 2009

rr_AnnualReturn2009

23.02%

Annual Return 2010

rr_AnnualReturn2010

3.36%

Year to Date Return, Label

rr_YearToDateReturnLabel

year-to-date return

Bar Chart, Year to Date Return, Date

rr_BarChartYearToDateReturnDate

Jun. 30, 2011

Bar Chart, Year to Date Return

rr_BarChartYearToDateReturn

16.99%

Highest Quarterly Return, Label

rr_HighestQuarterlyReturnLabel

highest return

Highest Quarterly Return, Date

rr_BarChartHighestQuarterlyReturnDate

Jun. 30, 2003

Highest Quarterly Return

rr_BarChartHighestQuarterlyReturn

13.87%

Lowest Quarterly Return, Label

rr_LowestQuarterlyReturnLabel

lowest return

Lowest Quarterly Return, Date

rr_BarChartLowestQuarterlyReturnDate

Mar. 31, 2008

Lowest Quarterly Return

rr_BarChartLowestQuarterlyReturn

(17.14%)

1 Year

rr_AverageAnnualReturnYear01

(2.07%)

5 Years

rr_AverageAnnualReturnYear05

1.17%

10 Years

rr_AverageAnnualReturnYear10

2.13%

BLACKROCK HEALTHCARE FUND, INC. | Investor A Shares | Return After Taxes on Distributions

Risk/Return:

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

(2.33%)

5 Years

rr_AverageAnnualReturnYear05

0.05%

10 Years

rr_AverageAnnualReturnYear10

1.27%

BLACKROCK HEALTHCARE FUND, INC. | Investor A Shares | Return After Taxes on Distributions and Sale of Fund Shares

Risk/Return:

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

(1.35%)

5 Years

rr_AverageAnnualReturnYear05

0.70%

10 Years

rr_AverageAnnualReturnYear10

1.60%

BLACKROCK HEALTHCARE FUND, INC. | Investor B Shares

Risk/Return:

rr_RiskReturnAbstract

Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price)

rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice

none

Maximum Deferred Sales Charge (Load) (as a percentage of offering price or redemption proceeds, whichever is lower)

rr_MaximumDeferredSalesChargeOverOther

4.50%

^[2]

Management Fee

rr_ManagementFeesOverAssets

1.00%

Distribution and/or Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

1.00%

Other Expenses

rr_OtherExpensesOverAssets

0.47%

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

2.47%

1 Year

rr_ExpenseExampleYear01

700

3 Years

rr_ExpenseExampleYear03

1,120

5 Years

rr_ExpenseExampleYear05

1,516

10 Years

rr_ExpenseExampleYear10

2,587

1 Year

rr_ExpenseExampleNoRedemptionYear01

250

3 Years

rr_ExpenseExampleNoRedemptionYear03

770

5 Years

rr_ExpenseExampleNoRedemptionYear05

1,316

10 Years

rr_ExpenseExampleNoRedemptionYear10

2,587

1 Year

rr_AverageAnnualReturnYear01

(2.08%)

5 Years

rr_AverageAnnualReturnYear05

1.12%

10 Years

rr_AverageAnnualReturnYear10

2.03%

BLACKROCK HEALTHCARE FUND, INC. | Investor C Shares

Risk/Return:

rr_RiskReturnAbstract

Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price)

rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice

none

Maximum Deferred Sales Charge (Load) (as a percentage of offering price or redemption proceeds, whichever is lower)

rr_MaximumDeferredSalesChargeOverOther

1.00%

^[3]

Management Fee

rr_ManagementFeesOverAssets

1.00%

Distribution and/or Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

1.00%

Other Expenses

rr_OtherExpensesOverAssets

0.40%

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

2.40%

1 Year

rr_ExpenseExampleYear01

343

3 Years

rr_ExpenseExampleYear03

748

5 Years

rr_ExpenseExampleYear05

1,280

10 Years

rr_ExpenseExampleYear10

2,736

1 Year

rr_ExpenseExampleNoRedemptionYear01

243

3 Years

rr_ExpenseExampleNoRedemptionYear03

748

5 Years

rr_ExpenseExampleNoRedemptionYear05

1,280

10 Years

rr_ExpenseExampleNoRedemptionYear10

2,736

1 Year

rr_AverageAnnualReturnYear01

1.57%

5 Years

rr_AverageAnnualReturnYear05

1.47%

10 Years

rr_AverageAnnualReturnYear10

1.88%

BLACKROCK HEALTHCARE FUND, INC. | Institutional Shares

Risk/Return:

rr_RiskReturnAbstract

Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price)

rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice

none

Maximum Deferred Sales Charge (Load) (as a percentage of offering price or redemption proceeds, whichever is lower)

rr_MaximumDeferredSalesChargeOverOther

none

Management Fee

rr_ManagementFeesOverAssets

1.00%

Distribution and/or Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

none

Other Expenses

rr_OtherExpensesOverAssets

0.32%

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

1.32%

1 Year

rr_ExpenseExampleYear01

134

3 Years

rr_ExpenseExampleYear03

418

5 Years

rr_ExpenseExampleYear05

723

10 Years

rr_ExpenseExampleYear10

1,590

1 Year

rr_AverageAnnualReturnYear01

3.61%

5 Years

rr_AverageAnnualReturnYear05

2.50%

10 Years

rr_AverageAnnualReturnYear10

2.94%

BLACKROCK HEALTHCARE FUND, INC. | Class R Shares

Risk/Return:

rr_RiskReturnAbstract

Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price)

rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice

none

Maximum Deferred Sales Charge (Load) (as a percentage of offering price or redemption proceeds, whichever is lower)

rr_MaximumDeferredSalesChargeOverOther

none

Management Fee

rr_ManagementFeesOverAssets

1.00%

Distribution and/or Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

0.50%

Other Expenses

rr_OtherExpensesOverAssets

0.69%

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

2.19%

1 Year

rr_ExpenseExampleYear01

222

3 Years

rr_ExpenseExampleYear03

685

5 Years

rr_ExpenseExampleYear05

1,175

10 Years

rr_ExpenseExampleYear10

2,524

1 Year

rr_AverageAnnualReturnYear01

2.63%

5 Years

rr_AverageAnnualReturnYear05

1.74%

10 Years

rr_AverageAnnualReturnYear10

2.35%

BLACKROCK HEALTHCARE FUND, INC.

Risk/Return:

rr_RiskReturnAbstract

Risk/Return [Heading]

rr_RiskReturnHeading

Fund Overview

Key Facts About BlackRock Healthcare Fund, Inc.

Objective [Heading]

rr_ObjectiveHeading

Investment Objective

Objective, Primary [Text Block]

rr_ObjectivePrimaryTextBlock

The investment objective of BlackRock Healthcare Fund, Inc. ("Healthcare Fund" or the "Fund") is to seek long-term capital appreciation through worldwide investment in equity securities of companies that, in the opinion of Fund management, derive or are expected to derive a substantial portion of their sales from products and services in healthcare.

Expense [Heading]

rr_ExpenseHeading

Fees and Expenses of the Fund

Expense Narrative [Text Block]

rr_ExpenseNarrativeTextBlock

This table describes the fees and expenses that you may pay if you buy and hold shares of Healthcare Fund. You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least $25,000 in the fund complex advised by BlackRock Advisors, LLC ("BlackRock"). More information about these and other discounts is available from your financial professional and in the "Details About the Share Classes" section on page 16 of the Fund's prospectus and in the "Purchase of Shares" section on page II-58 of Part II of the Fund's statement of additional information.

Shareholder Fees Caption [Text]

rr_ShareholderFeesCaption

Shareholder Fees

(fees paid directly from your investment)

Operating Expenses Caption [Text]

rr_OperatingExpensesCaption

Annual Fund Operating Expenses

(expenses that you pay each year as a percentage of the value
of your investment)

Portfolio Turnover [Heading]

rr_PortfolioTurnoverHeading

Portfolio Turnover:

Portfolio Turnover [Text Block]

rr_PortfolioTurnoverTextBlock

The Fund pays transaction costs, such as commissions, when it buys and sells securities (or "turns over" its portfolio). A higher portfolio turnover may indicate higher transaction costs and may result in higher taxes when shares are held in a taxable account. These costs, which are not reflected in annual fund operating expenses or in the Example, affect the Fund's performance. During the most recent fiscal year, the Fund's turnover rate was 138% of the average value of its portfolio.

Portfolio Turnover, Rate

rr_PortfolioTurnoverRate

138.00%

Expense Breakpoint Discounts [Text]

rr_ExpenseBreakpointDiscounts

You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least $25,000 in the fund complex advised by BlackRock Advisors, LLC ("BlackRock").

Expense Breakpoint, Minimum Investment Required [Amount]

rr_ExpenseBreakpointMinimumInvestmentRequiredAmount

25,000

Expense Example [Heading]

rr_ExpenseExampleHeading

Example:

Expense Example Narrative [Text Block]

rr_ExpenseExampleNarrativeTextBlock

This Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. This Example assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return each year and that the Fund's operating expenses remain the same. Although your actual costs may be higher or lower, based on these assumptions your costs would be:

Expense Example, No Redemption, By Year, Caption [Text]

rr_ExpenseExampleNoRedemptionByYearCaption

You would pay the following expenses if you did not redeem your shares:

Strategy [Heading]

rr_StrategyHeading

Principal Investment Strategies of the Fund

Strategy Narrative [Text Block]

rr_StrategyNarrativeTextBlock

Healthcare Fund seeks to achieve its investment objective by investing in equity securities, primarily common stock, of healthcare companies. Under normal circumstances, the Fund will invest at least 80% of its assets in healthcare companies that it believes have good prospects for earnings growth. These will range from very large corporations to small, "developmental stage" companies. Healthcare companies can include, but are not limited to, businesses involved in the development, production and distribution or delivery of medical and pharmaceutical products and services, companies engaged in biotechnology and medical research and development, companies that may design, manufacture or distribute medical, dental and optical equipment and supplies, including diagnostic equipment, and companies that may also provide diagnostic services or operate health facilities and hospitals or provide related administrative, management and financial support. The Fund may also invest in convertible securities and rights. The Fund may invest without limit in foreign securities and in depositary receipts.

Risk [Heading]

rr_RiskHeading

Principal Risks of Investing in the Fund

Risk Narrative [Text Block]

rr_RiskNarrativeTextBlock

Risk is inherent in all investing. The value of your investment in Healthcare Fund, as well as the amount of return you receive on your investment, may fluctuate significantly from day to day and over time. You may lose part or all of your investment in the Fund or your investment may not perform as well as other similar investments. The following is a summary description of certain risks of investing in the Fund.

n Convertible Securities Risk — The market value of a convertible security performs like that of a regular debt security; that is, if market interest rates rise, the value of a convertible security usually falls. In addition, convertible securities are subject to the risk that the issuer will not be able to pay interest or dividends when due, and their market value may change based on changes in the issuer's credit rating or the market's perception of the issuer's creditworthiness. Since it derives a portion of its value from the common stock into which it may be converted, a convertible security is also subject to the same types of market and issuer risk as apply to the underlying common stock.

n Depositary Receipts Risk — The issuers of unsponsored depositary receipts are not obligated to disclose information that is, in the United States, considered material. Therefore, there may be less information available regarding these issuers, and there may not be a correlation between such information and the market value of the depositary receipts. Depositary receipts are generally subject to the same risks as the foreign securities that they evidence or into which they may be converted.

n Development Stage Company Risk — Some of the companies in which the Fund invests may be in early stages of development. These companies are more likely than developed companies to lose substantial value if they experience problems developing their products or if there are changes in their management.

n Equity Securities Risk — Stock markets are volatile. The prices of equity securities fluctuate based on changes in a company's financial condition and overall market and economic conditions.

n Foreign Securities Risk — Foreign investments often involve special risks not present in U.S. investments that can increase the chances that the Fund will lose money. These risks include:

— The Fund generally holds its foreign securities and cash in foreign banks and securities depositories, which may be recently organized or new to the foreign custody business and may be subject to only limited or no regulatory oversight.

— Changes in foreign currency exchange rates can affect the value of the Fund's portfolio.

— The economies of certain foreign markets may not compare favorably with the economy of the United States with respect to such issues as growth of gross national product, reinvestment of capital, resources and balance of payments position.

— The governments of certain countries may prohibit or impose substantial restrictions on foreign investments in their capital markets or in certain industries.

— Many foreign governments do not supervise and regulate stock exchanges, brokers and the sale of securities to the same extent as does the United States and may not have laws to protect investors that are comparable to U.S. securities laws.

— Settlement and clearance procedures in certain foreign markets may result in delays in payment for, or delivery of, securities not typically associated with settlement and clearance of U.S. investments.

n Healthcare-Related Securities Risk — Healthcare companies are strongly affected by worldwide scientific or technological developments. Their products may rapidly become obsolete. Many healthcare companies are also subject to significant government regulation and may be affected by changes in governmental policies.

n Healthcare Sector (Concentration) Risk — As a sector fund that invests in healthcare companies, the Fund is subject to the risks associated with this sector. This makes the Fund more vulnerable to price changes of healthcare company securities and factors that affect the healthcare sector than a more broadly diversified mutual fund. Healthcare companies are strongly affected by worldwide scientific or technological developments. Their products may rapidly become obsolete. Many healthcare companies are also subject to significant government regulation and may be affected by changes in governmental policies. Because the Fund invests primarily in one sector, there is the risk that the Fund will perform poorly during a downturn in that sector.

n Market Risk and Selection Risk — Market risk is the risk that one or more markets in which the Fund invests will go down in value, including the possibility that the markets will go down sharply and unpredictably. Selection risk is the risk that the securities selected by Fund management will underperform the markets, the relevant indices or the securities selected by other funds with similar investment objectives and investment strategies. This means you may lose money.

n Non-Diversification Risk — The Fund is a non-diversified fund. Because the Fund may invest in securities of a smaller number of issuers, it may be more exposed to the risks associated with and developments affecting an individual issuer than a fund that invests more widely.

n Rights Risk — The failure to exercise subscription rights to purchase common stock would result in the dilution of the Fund's interest in the issuing company. The market for such rights is not well developed, and, accordingly, the Fund may not always realize full value on the sale of rights.

n Small Cap and Emerging Growth Securities Risk — Small cap or emerging growth companies may have limited product lines or markets. They may be less financially secure than larger, more established companies. They may depend on a more limited management group than larger cap companies.

Risk Lose Money [Text]

rr_RiskLoseMoney

You may lose part or all of your investment in the Fund or your investment may not perform as well as other similar investments.

Risk Nondiversified Status [Text]

rr_RiskNondiversifiedStatus

Non-Diversification Risk — The Fund is a non-diversified fund. Because the Fund may invest in securities of a smaller number of issuers, it may be more exposed to the risks associated with and developments affecting an individual issuer than a fund that invests more widely.

Bar Chart and Performance Table [Heading]

rr_BarChartAndPerformanceTableHeading

Performance Information

Performance Narrative [Text Block]

rr_PerformanceNarrativeTextBlock

The information below shows you how Healthcare Fund's performance has varied year by year and provides some indication of the risks of investing in the Fund. The table compares the Fund's performance to that of the Standard & Poor's^® ("S&P") 500 Index and the Russell 3000^® Health Care Index. The Fund believes the Russell 3000^® Health Care Index provides an appropriate performance comparison because it reflects the performance of funds with investment objectives similar to the Fund. As with all such investments, past performance (before and after taxes) is not an indication of future results. Sales charges are not reflected in the bar chart. If they were, returns would be less than those shown. However, the table includes all applicable fees and sales charges. If the Fund's investment manager and its affiliates had not waived or reimbursed certain Fund expenses during these periods, the Fund's returns would have been lower. Updated information on the Fund's results can be obtained by visiting www.blackrock.com/funds or can be obtained by phone at (800) 882-0052.

Performance Information Illustrates Variability of Returns [Text]

rr_PerformanceInformationIllustratesVariabilityOfReturns

The information below shows you how Healthcare Fund's performance has varied year by year and provides some indication of the risks of investing in the Fund.

Performance Availability Phone [Text]

rr_PerformanceAvailabilityPhone

(800) 882-0052

Performance Availability Website Address [Text]

rr_PerformanceAvailabilityWebSiteAddress

www.blackrock.com/funds

Performance Past Does Not Indicate Future [Text]

rr_PerformancePastDoesNotIndicateFuture

As with all such investments, past performance (before and after taxes) is not an indication of future results.

Bar Chart [Heading]

rr_BarChartHeading

Investor A Shares

ANNUAL TOTAL RETURNS

BlackRock Healthcare Fund, Inc.

As of 12/31

Bar Chart Does Not Reflect Sales Loads [Text]

rr_BarChartDoesNotReflectSalesLoads

Sales charges are not reflected in the bar chart. If they were, returns would be less than those shown.

Bar Chart Closing [Text Block]

rr_BarChartClosingTextBlock

During the period shown in the bar chart above, the highest return for a quarter was 13.87% (quarter ended June 30, 2003) and the lowest return for a quarter was –17.14% (quarter ended March 31, 2008). The year-to-date return as of June 30, 2011 was 16.99%.

Performance Table Heading

rr_PerformanceTableHeading

As of 12/31/10
Average Annual Total Returns

Performance Table Does Reflect Sales Loads

rr_PerformanceTableDoesReflectSalesLoads

However, the table includes all applicable fees and sales charges.

Performance Table Uses Highest Federal Rate

rr_PerformanceTableUsesHighestFederalRate

After-tax returns are calculated using the historical highest individual Federal marginal income tax rates and do not reflect the impact of state and local taxes. 

Performance Table Not Relevant to Tax Deferred

rr_PerformanceTableNotRelevantToTaxDeferred

Actual after-tax returns depend on an investor's tax situation and may differ from those shown, and the after-tax returns shown are not relevant to investors who hold their Fund shares through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts or through tax-advantaged education savings accounts.

Performance Table One Class of after Tax Shown [Text]

rr_PerformanceTableOneClassOfAfterTaxShown

After-tax returns are shown for Investor A Shares only, and the after-tax returns for Investor B, Investor C, Institutional and Class R Shares will vary.

Performance Table Narrative

rr_PerformanceTableNarrativeTextBlock

After-tax returns are calculated using the historical highest individual Federal marginal income tax rates and do not reflect the impact of state and local taxes. Actual after-tax returns depend on an investor's tax situation and may differ from those shown, and the after-tax returns shown are not relevant to investors who hold their Fund shares through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts or through tax-advantaged education savings accounts. After-tax returns are shown for Investor A Shares only, and the after-tax returns for Investor B, Investor C, Institutional and Class R Shares will vary.

BLACKROCK HEALTHCARE FUND, INC. | S&P 500 Index (reflects no deduction for fees, expenses or taxes)

Risk/Return:

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

15.06%

5 Years

rr_AverageAnnualReturnYear05

2.29%

10 Years

rr_AverageAnnualReturnYear10

1.41%

BLACKROCK HEALTHCARE FUND, INC. | Russell 3000 Health Care Index (reflects no deduction for fees, expenses or taxes)

Risk/Return:

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

5.88%

5 Years

rr_AverageAnnualReturnYear05

2.31%

10 Years

rr_AverageAnnualReturnYear10

0.21%

[1] A contingent deferred sales charge ("CDSC") of 1.00% is assessed on certain redemptions of Investor A Shares made within 18 months after purchase where no initial sales charge was paid at time of purchase as part of an investment of $1,000,000 or more.

[2] The CDSC is 4.50% if shares are redeemed in less than one year. The CDSC for Investor B Shares decreases for redemptions made in subsequent years. After six years, there is no CDSC on Investor B Shares. (See the section "Details About the Share Classes — Investor B Shares" for a complete schedule of CDSCs.)

[3] There is no CDSC on Investor C Shares after one year.

XML



Label	Element	Value
Risk/Return:	rr_RiskReturnAbstract
Prospectus Date	rr_ProspectusDate	Aug. 29, 2011

XML



BLACKROCK HEALTHCARE FUND, INC.

Fund Overview

Key Facts About BlackRock Healthcare Fund, Inc.

Investment Objective

The investment objective of BlackRock Healthcare Fund, Inc. ("Healthcare Fund" or the "Fund") is to seek long-term capital appreciation through worldwide investment in equity securities of companies that, in the opinion of Fund management, derive or are expected to derive a substantial portion of their sales from products and services in healthcare.

Fees and Expenses of the Fund

This table describes the fees and expenses that you may pay if you buy and hold shares of Healthcare Fund. You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least $25,000 in the fund complex advised by BlackRock Advisors, LLC ("BlackRock"). More information about these and other discounts is available from your financial professional and in the "Details About the Share Classes" section on page 16 of the Fund's prospectus and in the "Purchase of Shares" section on page II-58 of Part II of the Fund's statement of additional information.

Shareholder Fees

(fees paid directly from your investment)

Shareholder Fees - BLACKROCK HEALTHCARE FUND, INC.	Investor A Shares		Investor B Shares		Investor C Shares		Institutional Shares	Class R Shares
Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price)	5.25%		none		none		none	none
Maximum Deferred Sales Charge (Load) (as a percentage of offering price or redemption proceeds, whichever is lower)	none	[1]	4.50%	[2]	1.00%	[3]	none	none

Annual Fund Operating Expenses

(expenses that you pay each year as a percentage of the value
of your investment)

Annual Fund Operating Expenses - BLACKROCK HEALTHCARE FUND, INC.	Investor A Shares	Investor B Shares	Investor C Shares	Institutional Shares	Class R Shares
Management Fee	1.00%	1.00%	1.00%	1.00%	1.00%
Distribution and/or Service (12b-1) Fees	0.25%	1.00%	1.00%	none	0.50%
Other Expenses	0.33%	0.47%	0.40%	0.32%	0.69%
Total Annual Fund Operating Expenses	1.58%	2.47%	2.40%	1.32%	2.19%

Example:

This Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. This Example assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return each year and that the Fund's operating expenses remain the same. Although your actual costs may be higher or lower, based on these assumptions your costs would be:

Expense Example - BLACKROCK HEALTHCARE FUND, INC. (USD $)	1 Year	3 Years	5 Years	10 Years
Investor A Shares	677	998	1,340	2,305
Investor B Shares	700	1,120	1,516	2,587
Investor C Shares	343	748	1,280	2,736
Institutional Shares	134	418	723	1,590
Class R Shares	222	685	1,175	2,524

You would pay the following expenses if you did not redeem your shares:

Expense Example, No Redemption - BLACKROCK HEALTHCARE FUND, INC. (USD $)	1 Year	3 Years	5 Years	10 Years
Investor B Shares	250	770	1,316	2,587
Investor C Shares	243	748	1,280	2,736

Portfolio Turnover:

The Fund pays transaction costs, such as commissions, when it buys and sells securities (or "turns over" its portfolio). A higher portfolio turnover may indicate higher transaction costs and may result in higher taxes when shares are held in a taxable account. These costs, which are not reflected in annual fund operating expenses or in the Example, affect the Fund's performance. During the most recent fiscal year, the Fund's turnover rate was 138% of the average value of its portfolio.

Principal Investment Strategies of the Fund

Healthcare Fund seeks to achieve its investment objective by investing in equity securities, primarily common stock, of healthcare companies. Under normal circumstances, the Fund will invest at least 80% of its assets in healthcare companies that it believes have good prospects for earnings growth. These will range from very large corporations to small, "developmental stage" companies. Healthcare companies can include, but are not limited to, businesses involved in the development, production and distribution or delivery of medical and pharmaceutical products and services, companies engaged in biotechnology and medical research and development, companies that may design, manufacture or distribute medical, dental and optical equipment and supplies, including diagnostic equipment, and companies that may also provide diagnostic services or operate health facilities and hospitals or provide related administrative, management and financial support. The Fund may also invest in convertible securities and rights. The Fund may invest without limit in foreign securities and in depositary receipts.

Principal Risks of Investing in the Fund

Risk is inherent in all investing. The value of your investment in Healthcare Fund, as well as the amount of return you receive on your investment, may fluctuate significantly from day to day and over time. You may lose part or all of your investment in the Fund or your investment may not perform as well as other similar investments. The following is a summary description of certain risks of investing in the Fund.

n Convertible Securities Risk — The market value of a convertible security performs like that of a regular debt security; that is, if market interest rates rise, the value of a convertible security usually falls. In addition, convertible securities are subject to the risk that the issuer will not be able to pay interest or dividends when due, and their market value may change based on changes in the issuer's credit rating or the market's perception of the issuer's creditworthiness. Since it derives a portion of its value from the common stock into which it may be converted, a convertible security is also subject to the same types of market and issuer risk as apply to the underlying common stock.

n Depositary Receipts Risk — The issuers of unsponsored depositary receipts are not obligated to disclose information that is, in the United States, considered material. Therefore, there may be less information available regarding these issuers, and there may not be a correlation between such information and the market value of the depositary receipts. Depositary receipts are generally subject to the same risks as the foreign securities that they evidence or into which they may be converted.

n Development Stage Company Risk — Some of the companies in which the Fund invests may be in early stages of development. These companies are more likely than developed companies to lose substantial value if they experience problems developing their products or if there are changes in their management.

n Equity Securities Risk — Stock markets are volatile. The prices of equity securities fluctuate based on changes in a company's financial condition and overall market and economic conditions.

n Foreign Securities Risk — Foreign investments often involve special risks not present in U.S. investments that can increase the chances that the Fund will lose money. These risks include:

— The Fund generally holds its foreign securities and cash in foreign banks and securities depositories, which may be recently organized or new to the foreign custody business and may be subject to only limited or no regulatory oversight.

— Changes in foreign currency exchange rates can affect the value of the Fund's portfolio.

— The economies of certain foreign markets may not compare favorably with the economy of the United States with respect to such issues as growth of gross national product, reinvestment of capital, resources and balance of payments position.

— The governments of certain countries may prohibit or impose substantial restrictions on foreign investments in their capital markets or in certain industries.

— Many foreign governments do not supervise and regulate stock exchanges, brokers and the sale of securities to the same extent as does the United States and may not have laws to protect investors that are comparable to U.S. securities laws.

— Settlement and clearance procedures in certain foreign markets may result in delays in payment for, or delivery of, securities not typically associated with settlement and clearance of U.S. investments.

n Healthcare-Related Securities Risk — Healthcare companies are strongly affected by worldwide scientific or technological developments. Their products may rapidly become obsolete. Many healthcare companies are also subject to significant government regulation and may be affected by changes in governmental policies.

n Healthcare Sector (Concentration) Risk — As a sector fund that invests in healthcare companies, the Fund is subject to the risks associated with this sector. This makes the Fund more vulnerable to price changes of healthcare company securities and factors that affect the healthcare sector than a more broadly diversified mutual fund. Healthcare companies are strongly affected by worldwide scientific or technological developments. Their products may rapidly become obsolete. Many healthcare companies are also subject to significant government regulation and may be affected by changes in governmental policies. Because the Fund invests primarily in one sector, there is the risk that the Fund will perform poorly during a downturn in that sector.

n Market Risk and Selection Risk — Market risk is the risk that one or more markets in which the Fund invests will go down in value, including the possibility that the markets will go down sharply and unpredictably. Selection risk is the risk that the securities selected by Fund management will underperform the markets, the relevant indices or the securities selected by other funds with similar investment objectives and investment strategies. This means you may lose money.

n Non-Diversification Risk — The Fund is a non-diversified fund. Because the Fund may invest in securities of a smaller number of issuers, it may be more exposed to the risks associated with and developments affecting an individual issuer than a fund that invests more widely.

n Rights Risk — The failure to exercise subscription rights to purchase common stock would result in the dilution of the Fund's interest in the issuing company. The market for such rights is not well developed, and, accordingly, the Fund may not always realize full value on the sale of rights.

n Small Cap and Emerging Growth Securities Risk — Small cap or emerging growth companies may have limited product lines or markets. They may be less financially secure than larger, more established companies. They may depend on a more limited management group than larger cap companies.

Performance Information

The information below shows you how Healthcare Fund's performance has varied year by year and provides some indication of the risks of investing in the Fund. The table compares the Fund's performance to that of the Standard & Poor's^® ("S&P") 500 Index and the Russell 3000^® Health Care Index. The Fund believes the Russell 3000^® Health Care Index provides an appropriate performance comparison because it reflects the performance of funds with investment objectives similar to the Fund. As with all such investments, past performance (before and after taxes) is not an indication of future results. Sales charges are not reflected in the bar chart. If they were, returns would be less than those shown. However, the table includes all applicable fees and sales charges. If the Fund's investment manager and its affiliates had not waived or reimbursed certain Fund expenses during these periods, the Fund's returns would have been lower. Updated information on the Fund's results can be obtained by visiting www.blackrock.com/funds or can be obtained by phone at (800) 882-0052.

Investor A Shares

ANNUAL TOTAL RETURNS

BlackRock Healthcare Fund, Inc.

As of 12/31

During the period shown in the bar chart above, the highest return for a quarter was 13.87% (quarter ended June 30, 2003) and the lowest return for a quarter was –17.14% (quarter ended March 31, 2008). The year-to-date return as of June 30, 2011 was 16.99%.

As of 12/31/10
Average Annual Total Returns

Average Annual Total Returns - BLACKROCK HEALTHCARE FUND, INC.	1 Year	5 Years	10 Years
Investor A Shares	(2.07%)	1.17%	2.13%
Investor A Shares Return After Taxes on Distributions	(2.33%)	0.05%	1.27%
Investor A Shares Return After Taxes on Distributions and Sale of Fund Shares	(1.35%)	0.70%	1.60%
Investor B Shares	(2.08%)	1.12%	2.03%
Investor C Shares	1.57%	1.47%	1.88%
Institutional Shares	3.61%	2.50%	2.94%
Class R Shares	2.63%	1.74%	2.35%
S&P 500 Index (reflects no deduction for fees, expenses or taxes)	15.06%	2.29%	1.41%
Russell 3000 Health Care Index (reflects no deduction for fees, expenses or taxes)	5.88%	2.31%	0.21%

After-tax returns are calculated using the historical highest individual Federal marginal income tax rates and do not reflect the impact of state and local taxes. Actual after-tax returns depend on an investor's tax situation and may differ from those shown, and the after-tax returns shown are not relevant to investors who hold their Fund shares through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts or through tax-advantaged education savings accounts. After-tax returns are shown for Investor A Shares only, and the after-tax returns for Investor B, Investor C, Institutional and Class R Shares will vary.

[1] A contingent deferred sales charge ("CDSC") of 1.00% is assessed on certain redemptions of Investor A Shares made within 18 months after purchase where no initial sales charge was paid at time of purchase as part of an investment of $1,000,000 or more.

[2] The CDSC is 4.50% if shares are redeemed in less than one year. The CDSC for Investor B Shares decreases for redemptions made in subsequent years. After six years, there is no CDSC on Investor B Shares. (See the section "Details About the Share Classes — Investor B Shares" for a complete schedule of CDSCs.)

[3] There is no CDSC on Investor C Shares after one year.