<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0306</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2017-03-22</periodOfReport>

    <notSubjectToSection16>1</notSubjectToSection16>

    <issuer>
        <issuerCik>0000885306</issuerCik>
        <issuerName>CYNOSURE INC</issuerName>
        <issuerTradingSymbol>CYNO</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001328980</rptOwnerCik>
            <rptOwnerName>Hatsopoulos Marina</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>C/O CYNOSURE, INC.</rptOwnerStreet1>
            <rptOwnerStreet2>5 CARLISLE ROAD</rptOwnerStreet2>
            <rptOwnerCity>WESTFORD</rptOwnerCity>
            <rptOwnerState>MA</rptOwnerState>
            <rptOwnerZipCode>01886</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>1</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

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                <value>Class A Common Stock</value>
            </securityTitle>
            <transactionDate>
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            </transactionDate>
            <deemedExecutionDate></deemedExecutionDate>
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                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionTimeliness>
                <value></value>
            </transactionTimeliness>
            <transactionAmounts>
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                    <value>18850</value>
                    <footnoteId id="F1"/>
                </transactionShares>
                <transactionPricePerShare>
                    <value>66.00</value>
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                <transactionAcquiredDisposedCode>
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                </transactionAcquiredDisposedCode>
            </transactionAmounts>
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                    <value>0</value>
                </sharesOwnedFollowingTransaction>
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            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
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        </nonDerivativeTransaction>
    </nonDerivativeTable>

    <derivativeTable>
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            <securityTitle>
                <value>Stock Option (right to purchase)</value>
            </securityTitle>
            <conversionOrExercisePrice>
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            <transactionDate>
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                <transactionPricePerShare>
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            <expirationDate>
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        <derivativeTransaction>
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            <expirationDate>
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        <derivativeTransaction>
            <securityTitle>
                <value>Stock Option (right to purchase)</value>
            </securityTitle>
            <conversionOrExercisePrice>
                <value>13.97</value>
            </conversionOrExercisePrice>
            <transactionDate>
                <value>2017-03-22</value>
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            <deemedExecutionDate></deemedExecutionDate>
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            <transactionTimeliness>
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            <transactionAmounts>
                <transactionShares>
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                <transactionPricePerShare>
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            <exerciseDate>
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            <expirationDate>
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            <underlyingSecurity>
                <underlyingSecurityTitle>
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                </underlyingSecurityTitle>
                <underlyingSecurityShares>
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                </underlyingSecurityShares>
            </underlyingSecurity>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
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                <directOrIndirectOwnership>
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        </derivativeTransaction>
        <derivativeTransaction>
            <securityTitle>
                <value>Stock Option (right to purchase)</value>
            </securityTitle>
            <conversionOrExercisePrice>
                <value>11.89</value>
            </conversionOrExercisePrice>
            <transactionDate>
                <value>2017-03-22</value>
            </transactionDate>
            <deemedExecutionDate></deemedExecutionDate>
            <transactionCoding>
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            <transactionTimeliness>
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            <transactionAmounts>
                <transactionShares>
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                <transactionPricePerShare>
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                <transactionAcquiredDisposedCode>
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            <exerciseDate>
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            <expirationDate>
                <value>2021-07-27</value>
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            <underlyingSecurity>
                <underlyingSecurityTitle>
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                <directOrIndirectOwnership>
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        <derivativeTransaction>
            <securityTitle>
                <value>Stock Option (right to purchase)</value>
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            <transactionDate>
                <value>2017-03-22</value>
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            <transactionTimeliness>
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            <transactionAmounts>
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                <transactionPricePerShare>
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                <transactionAcquiredDisposedCode>
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            <expirationDate>
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        <derivativeTransaction>
            <securityTitle>
                <value>Stock Option (right to purchase)</value>
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                <value>2017-03-22</value>
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            <expirationDate>
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            <underlyingSecurity>
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        <derivativeTransaction>
            <securityTitle>
                <value>Stock Option (right to purchase)</value>
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            <transactionTimeliness>
                <value></value>
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                    <footnoteId id="F2"/>
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                <transactionAcquiredDisposedCode>
                    <value>D</value>
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            <expirationDate>
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        <derivativeTransaction>
            <securityTitle>
                <value>Stock Option (right to purchase)</value>
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                <transactionCode>D</transactionCode>
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                <value></value>
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                <transactionShares>
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                <transactionPricePerShare>
                    <footnoteId id="F2"/>
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                <transactionAcquiredDisposedCode>
                    <value>D</value>
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                <underlyingSecurityTitle>
                    <value>Class A Common Stock</value>
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                </underlyingSecurityShares>
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                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
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        </derivativeTransaction>
        <derivativeTransaction>
            <securityTitle>
                <value>Restricted Stock Units</value>
            </securityTitle>
            <conversionOrExercisePrice>
                <footnoteId id="F3"/>
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            <transactionDate>
                <value>2017-03-22</value>
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            <transactionTimeliness>
                <value></value>
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                <transactionShares>
                    <value>1272</value>
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                <transactionPricePerShare>
                    <footnoteId id="F4"/>
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                    <value>D</value>
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            <exerciseDate>
                <footnoteId id="F4"/>
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            <expirationDate>
                <value>2026-05-11</value>
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            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Class A Common Stock</value>
                </underlyingSecurityTitle>
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                    <value>1272</value>
                </underlyingSecurityShares>
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                    <value>0</value>
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    </derivativeTable>

    <footnotes>
        <footnote id="F1">Pursuant to the terms of that certain Agreement and Plan of Merger, dated as of February 14, 2017, by and among Hologic, Inc., Minuteman Merger Sub, Inc. and Cynosure, Inc. (the &quot;Merger Agreement&quot;), these shares were tendered and disposed of at the Acceptance Time (all terms capitalized but not defined shall have the meaning given to them in the Merger Agreement) in exchange for the right to receive $66.00 per share, net to the seller in cash, without interest, less any required withholding taxes (the &quot;Merger Consideration&quot;).</footnote>
        <footnote id="F2">This stock option was fully vested and exercisable prior to the Effective Time. Pursuant to the terms of the Merger Agreement, each outstanding and unexercised stock option as of immediately prior to the Effective Time, whether vested or unvested, was automatically canceled and converted into the right to receive, for each underlying share, the difference between the Merger Consideration and the exercise price per share of the option.</footnote>
        <footnote id="F3">Each restricted stock unit represents a contingent right to receive one share of Cynosure, Inc.'s common stock.</footnote>
        <footnote id="F4">Pursuant to the terms of the Merger Agreement, each outstanding and unvested restricted stock unit as of immediately prior to the Effective Time vested in full and was automatically canceled and converted into the right to receive the Merger Consideration for each underlying share.</footnote>
    </footnotes>

    <remarks></remarks>

    <ownerSignature>
        <signatureName>/s/ Christopher J. Geberth, Attorney-in-Fact</signatureName>
        <signatureDate>2017-03-24</signatureDate>
    </ownerSignature>
</ownershipDocument>
