<?xml version="1.0"?>
<ownershipDocument>
    <schemaVersion>X0201</schemaVersion>

    <documentType>3/A</documentType><periodOfReport>2003-11-05</periodOfReport><dateOfOriginalSubmission>2003-02-26</dateOfOriginalSubmission>
    <noSecuritiesOwned>0</noSecuritiesOwned>

    <issuer>
        <issuerCik>0001104332</issuerCik>
        <issuerName>SUMMUS INC USA</issuerName>
        <issuerTradingSymbol>SUMU</issuerTradingSymbol></issuer><reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001219408</rptOwnerCik>
            <rptOwnerName>GUENTHER NEIL R</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>434 FAYETTEVILLE STREET</rptOwnerStreet1>
            <rptOwnerStreet2>SUITE 600</rptOwnerStreet2>
            <rptOwnerCity>RALEIGH</rptOwnerCity>
            <rptOwnerState>NC</rptOwnerState>
            <rptOwnerZipCode>27601</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
            <reportingOwnerRelationship>
<isDirector>1</isDirector><isOfficer>0</isOfficer><isTenPercentOwner>0</isTenPercentOwner><isOther>0</isOther></reportingOwnerRelationship></reportingOwner><nonDerivativeTable><nonDerivativeHolding><securityTitle><value>Common Stock</value></securityTitle><postTransactionAmounts><sharesOwnedFollowingTransaction><value>926962</value></sharesOwnedFollowingTransaction></postTransactionAmounts><ownershipNature><directOrIndirectOwnership><value>D</value><footnoteId id="F1"/></directOrIndirectOwnership><natureOfOwnership><value/></natureOfOwnership></ownershipNature></nonDerivativeHolding><nonDerivativeHolding><securityTitle><value>Common Stock</value></securityTitle><postTransactionAmounts><sharesOwnedFollowingTransaction><value>40000</value></sharesOwnedFollowingTransaction></postTransactionAmounts><ownershipNature><directOrIndirectOwnership><value>I</value></directOrIndirectOwnership><natureOfOwnership><value>See Footnote</value><footnoteId id="F2"/></natureOfOwnership></ownershipNature></nonDerivativeHolding></nonDerivativeTable><derivativeTable><derivativeHolding><securityTitle><value>Warrants (Option to Purchase)</value></securityTitle><conversionOrExercisePrice><value>1.38</value></conversionOrExercisePrice><exerciseDate><value>2001-06-06</value></exerciseDate><expirationDate><value>2005-12-06</value></expirationDate><underlyingSecurity><underlyingSecurityTitle><value>Common Stock</value></underlyingSecurityTitle><underlyingSecurityShares><value>20000</value></underlyingSecurityShares></underlyingSecurity><ownershipNature><directOrIndirectOwnership><value>D</value></directOrIndirectOwnership><natureOfOwnership><value/></natureOfOwnership></ownershipNature></derivativeHolding><derivativeHolding><securityTitle><value>Warrants (Option to Purchase)</value></securityTitle><conversionOrExercisePrice><value>1.38</value></conversionOrExercisePrice><exerciseDate><value>2001-06-15</value></exerciseDate><expirationDate><value>2005-12-15</value></expirationDate><underlyingSecurity><underlyingSecurityTitle><value>Common Stock</value></underlyingSecurityTitle><underlyingSecurityShares><value>30000</value></underlyingSecurityShares></underlyingSecurity><ownershipNature><directOrIndirectOwnership><value>D</value></directOrIndirectOwnership><natureOfOwnership><value/></natureOfOwnership></ownershipNature></derivativeHolding><derivativeHolding><securityTitle><value>Warrants (Option to Purchase)</value></securityTitle><conversionOrExercisePrice><value>1.38</value></conversionOrExercisePrice><exerciseDate><value>2001-07-02</value></exerciseDate><expirationDate><value>2006-01-02</value></expirationDate><underlyingSecurity><underlyingSecurityTitle><value>Common Stock</value></underlyingSecurityTitle><underlyingSecurityShares><value>30000</value></underlyingSecurityShares></underlyingSecurity><ownershipNature><directOrIndirectOwnership><value>D</value></directOrIndirectOwnership><natureOfOwnership><value/></natureOfOwnership></ownershipNature></derivativeHolding><derivativeHolding><securityTitle><value>Warrants (Option to Purchase)</value></securityTitle><conversionOrExercisePrice><value>1.38</value></conversionOrExercisePrice><exerciseDate><value>2001-07-16</value></exerciseDate><expirationDate><value>2006-01-16</value></expirationDate><underlyingSecurity><underlyingSecurityTitle><value>Common Stock</value></underlyingSecurityTitle><underlyingSecurityShares><value>20000</value></underlyingSecurityShares></underlyingSecurity><ownershipNature><directOrIndirectOwnership><value>D</value></directOrIndirectOwnership><natureOfOwnership><value/></natureOfOwnership></ownershipNature></derivativeHolding><derivativeHolding><securityTitle><value>Warrants (Option to Purchase)</value></securityTitle><conversionOrExercisePrice><value>1.38</value></conversionOrExercisePrice><exerciseDate><value>2001-07-13</value></exerciseDate><expirationDate><value>2006-02-13</value></expirationDate><underlyingSecurity><underlyingSecurityTitle><value>Common Stock</value></underlyingSecurityTitle><underlyingSecurityShares><value>60000</value></underlyingSecurityShares></underlyingSecurity><ownershipNature><directOrIndirectOwnership><value>D</value></directOrIndirectOwnership><natureOfOwnership><value/></natureOfOwnership></ownershipNature></derivativeHolding><derivativeHolding><securityTitle><value>Warrants (Option to Purchase)</value></securityTitle><conversionOrExercisePrice><value>4.00</value></conversionOrExercisePrice><exerciseDate><value>2001-10-16</value></exerciseDate><expirationDate><value>2006-04-16</value></expirationDate><underlyingSecurity><underlyingSecurityTitle><value>Common Stock</value></underlyingSecurityTitle><underlyingSecurityShares><value>20000</value></underlyingSecurityShares></underlyingSecurity><ownershipNature><directOrIndirectOwnership><value>D</value></directOrIndirectOwnership><natureOfOwnership><value/></natureOfOwnership></ownershipNature></derivativeHolding><derivativeHolding><securityTitle><value>Warrants (Option to Purchase)</value></securityTitle><conversionOrExercisePrice><value>4.00</value></conversionOrExercisePrice><exerciseDate><value>2001-10-24</value></exerciseDate><expirationDate><value>2006-04-24</value></expirationDate><underlyingSecurity><underlyingSecurityTitle><value>Common Stock</value></underlyingSecurityTitle><underlyingSecurityShares><value>40000</value></underlyingSecurityShares></underlyingSecurity><ownershipNature><directOrIndirectOwnership><value>D</value></directOrIndirectOwnership><natureOfOwnership><value/></natureOfOwnership></ownershipNature></derivativeHolding><derivativeHolding><securityTitle><value>Warrants (Option to Purchase)</value></securityTitle><conversionOrExercisePrice><value>4.00</value></conversionOrExercisePrice><exerciseDate><value>2001-12-26</value></exerciseDate><expirationDate><value>2006-06-26</value></expirationDate><underlyingSecurity><underlyingSecurityTitle><value>Common Stock</value></underlyingSecurityTitle><underlyingSecurityShares><value>150000</value></underlyingSecurityShares></underlyingSecurity><ownershipNature><directOrIndirectOwnership><value>D</value></directOrIndirectOwnership><natureOfOwnership><value/></natureOfOwnership></ownershipNature></derivativeHolding><derivativeHolding><securityTitle><value>Warrants (Option to Purchase)</value></securityTitle><conversionOrExercisePrice><value>4.00</value></conversionOrExercisePrice><exerciseDate><value>2002-01-13</value></exerciseDate><expirationDate><value>2006-07-13</value></expirationDate><underlyingSecurity><underlyingSecurityTitle><value>Common Stock</value></underlyingSecurityTitle><underlyingSecurityShares><value>110000</value></underlyingSecurityShares></underlyingSecurity><ownershipNature><directOrIndirectOwnership><value>D</value></directOrIndirectOwnership><natureOfOwnership><value/></natureOfOwnership></ownershipNature></derivativeHolding><derivativeHolding><securityTitle><value>Warrants (Option to Purchase)</value></securityTitle><conversionOrExercisePrice><value>1.38</value></conversionOrExercisePrice><exerciseDate><value>2002-01-13</value></exerciseDate><expirationDate><value>2006-07-13</value></expirationDate><underlyingSecurity><underlyingSecurityTitle><value>Common Stock</value></underlyingSecurityTitle><underlyingSecurityShares><value>16000</value></underlyingSecurityShares></underlyingSecurity><ownershipNature><directOrIndirectOwnership><value>D</value></directOrIndirectOwnership><natureOfOwnership><value/></natureOfOwnership></ownershipNature></derivativeHolding><derivativeHolding><securityTitle><value>Warrants (Option to Purchase)</value></securityTitle><conversionOrExercisePrice><value>1.00</value></conversionOrExercisePrice><exerciseDate><value>2002-02-15</value></exerciseDate><expirationDate><value>2006-08-15</value></expirationDate><underlyingSecurity><underlyingSecurityTitle><value>Common Stock</value></underlyingSecurityTitle><underlyingSecurityShares><value>35000</value></underlyingSecurityShares></underlyingSecurity><ownershipNature><directOrIndirectOwnership><value>D</value></directOrIndirectOwnership><natureOfOwnership><value/></natureOfOwnership></ownershipNature></derivativeHolding><derivativeHolding><securityTitle><value>Warrants (Option to Purchase)</value></securityTitle><conversionOrExercisePrice><value>3.00</value></conversionOrExercisePrice><exerciseDate><value>2002-02-15</value></exerciseDate><expirationDate><value>2006-08-15</value></expirationDate><underlyingSecurity><underlyingSecurityTitle><value>Common Stock</value></underlyingSecurityTitle><underlyingSecurityShares><value>65000</value></underlyingSecurityShares></underlyingSecurity><ownershipNature><directOrIndirectOwnership><value>D</value></directOrIndirectOwnership><natureOfOwnership><value/></natureOfOwnership></ownershipNature></derivativeHolding><derivativeHolding><securityTitle><value>Warrants (Option to Purchase)</value></securityTitle><conversionOrExercisePrice><value>2.80</value></conversionOrExercisePrice><exerciseDate><value>2002-04-01</value></exerciseDate><expirationDate><value>2006-10-01</value></expirationDate><underlyingSecurity><underlyingSecurityTitle><value>Common Stock</value></underlyingSecurityTitle><underlyingSecurityShares><value>40000</value></underlyingSecurityShares></underlyingSecurity><ownershipNature><directOrIndirectOwnership><value>D</value></directOrIndirectOwnership><natureOfOwnership><value/></natureOfOwnership></ownershipNature></derivativeHolding><derivativeHolding><securityTitle><value>Warrants (Option to Purchase)</value></securityTitle><conversionOrExercisePrice><value>2.80</value></conversionOrExercisePrice><exerciseDate><value>2002-05-02</value></exerciseDate><expirationDate><value>2006-11-02</value></expirationDate><underlyingSecurity><underlyingSecurityTitle><value>Common Stock</value></underlyingSecurityTitle><underlyingSecurityShares><value>20000</value></underlyingSecurityShares></underlyingSecurity><ownershipNature><directOrIndirectOwnership><value>D</value></directOrIndirectOwnership><natureOfOwnership><value/></natureOfOwnership></ownershipNature></derivativeHolding><derivativeHolding><securityTitle><value>Warrants (Option to Purchase)</value></securityTitle><conversionOrExercisePrice><value>2.80</value></conversionOrExercisePrice><exerciseDate><value>2002-07-22</value></exerciseDate><expirationDate><value>2007-01-22</value></expirationDate><underlyingSecurity><underlyingSecurityTitle><value>Common Stock</value></underlyingSecurityTitle><underlyingSecurityShares><value>52000</value></underlyingSecurityShares></underlyingSecurity><ownershipNature><directOrIndirectOwnership><value>D</value></directOrIndirectOwnership><natureOfOwnership><value/></natureOfOwnership></ownershipNature></derivativeHolding><derivativeHolding><securityTitle><value>Warrants (Option to Purchase)</value></securityTitle><conversionOrExercisePrice><value>2.80</value></conversionOrExercisePrice><exerciseDate><value>2002-09-11</value></exerciseDate><expirationDate><value>2007-03-11</value></expirationDate><underlyingSecurity><underlyingSecurityTitle><value>Common Stock</value></underlyingSecurityTitle><underlyingSecurityShares><value>21000</value></underlyingSecurityShares></underlyingSecurity><ownershipNature><directOrIndirectOwnership><value>D</value></directOrIndirectOwnership><natureOfOwnership><value/></natureOfOwnership></ownershipNature></derivativeHolding><derivativeHolding><securityTitle><value>Warrants (Option to Purchase)</value></securityTitle><conversionOrExercisePrice><value>2.80</value></conversionOrExercisePrice><exerciseDate><value>2002-10-10</value></exerciseDate><expirationDate><value>2007-04-10</value></expirationDate><underlyingSecurity><underlyingSecurityTitle><value>Common Stock</value></underlyingSecurityTitle><underlyingSecurityShares><value>40000</value></underlyingSecurityShares></underlyingSecurity><ownershipNature><directOrIndirectOwnership><value>D</value></directOrIndirectOwnership><natureOfOwnership><value/></natureOfOwnership></ownershipNature></derivativeHolding><derivativeHolding><securityTitle><value>Warrants (Option to Purchase)</value></securityTitle><conversionOrExercisePrice><value>2.20</value></conversionOrExercisePrice><exerciseDate><value>2002-11-01</value></exerciseDate><expirationDate><value>2007-05-01</value></expirationDate><underlyingSecurity><underlyingSecurityTitle><value>Common Stock</value></underlyingSecurityTitle><underlyingSecurityShares><value>38000</value></underlyingSecurityShares></underlyingSecurity><ownershipNature><directOrIndirectOwnership><value>D</value></directOrIndirectOwnership><natureOfOwnership><value/></natureOfOwnership></ownershipNature></derivativeHolding><derivativeHolding><securityTitle><value>Warrants (Option to Purchase)</value></securityTitle><conversionOrExercisePrice><value>.60</value></conversionOrExercisePrice><exerciseDate><value>2003-03-11</value></exerciseDate><expirationDate><value>2007-09-12</value></expirationDate><underlyingSecurity><underlyingSecurityTitle><value>Common Stock</value></underlyingSecurityTitle><underlyingSecurityShares><value>246666</value></underlyingSecurityShares></underlyingSecurity><ownershipNature><directOrIndirectOwnership><value>D</value></directOrIndirectOwnership><natureOfOwnership><value/></natureOfOwnership></ownershipNature></derivativeHolding><derivativeHolding><securityTitle><value>Warrants (Option to Purchase)</value></securityTitle><conversionOrExercisePrice><value>1.43</value></conversionOrExercisePrice><exerciseDate><value>2003-04-02</value></exerciseDate><expirationDate><value>2007-10-02</value></expirationDate><underlyingSecurity><underlyingSecurityTitle><value>Common Stock</value></underlyingSecurityTitle><underlyingSecurityShares><value>186046</value></underlyingSecurityShares></underlyingSecurity><ownershipNature><directOrIndirectOwnership><value>D</value></directOrIndirectOwnership><natureOfOwnership><value/></natureOfOwnership></ownershipNature></derivativeHolding><derivativeHolding><securityTitle><value>Warrants (Option to Purchase)</value></securityTitle><conversionOrExercisePrice><value>1.47</value></conversionOrExercisePrice><exerciseDate><value>2003-04-25</value></exerciseDate><expirationDate><value>2007-10-25</value></expirationDate><underlyingSecurity><underlyingSecurityTitle><value>Common Stock</value></underlyingSecurityTitle><underlyingSecurityShares><value>85106</value></underlyingSecurityShares></underlyingSecurity><ownershipNature><directOrIndirectOwnership><value>D</value></directOrIndirectOwnership><natureOfOwnership><value/></natureOfOwnership></ownershipNature></derivativeHolding><derivativeHolding><securityTitle><value>Warrants (Option to Purchase)</value></securityTitle><conversionOrExercisePrice><value>1.50</value></conversionOrExercisePrice><exerciseDate><value>2003-05-12</value></exerciseDate><expirationDate><value>2007-11-12</value></expirationDate><underlyingSecurity><underlyingSecurityTitle><value>Common Stock</value></underlyingSecurityTitle><underlyingSecurityShares><value>85106</value></underlyingSecurityShares></underlyingSecurity><ownershipNature><directOrIndirectOwnership><value>D</value></directOrIndirectOwnership><natureOfOwnership><value/></natureOfOwnership></ownershipNature></derivativeHolding><derivativeHolding><securityTitle><value>Warrants (Option to Purchase)</value></securityTitle><conversionOrExercisePrice><value>1.38</value></conversionOrExercisePrice><exerciseDate><value>2001-09-27</value></exerciseDate><expirationDate><value>2006-03-27</value></expirationDate><underlyingSecurity><underlyingSecurityTitle><value>Common Stock</value></underlyingSecurityTitle><underlyingSecurityShares><value>80000</value></underlyingSecurityShares></underlyingSecurity><ownershipNature><directOrIndirectOwnership><value>I</value></directOrIndirectOwnership><natureOfOwnership><value>See Footnote</value><footnoteId id="F4"/></natureOfOwnership></ownershipNature></derivativeHolding><derivativeHolding><securityTitle><value>Options (Option to Purchase)</value></securityTitle><conversionOrExercisePrice><value>.47</value></conversionOrExercisePrice><exerciseDate><value>2003-02-13</value></exerciseDate><expirationDate><value>2013-02-13</value></expirationDate><underlyingSecurity><underlyingSecurityTitle><value>Common Stock</value></underlyingSecurityTitle><underlyingSecurityShares><value>30000</value><footnoteId id="F3"/></underlyingSecurityShares></underlyingSecurity><ownershipNature><directOrIndirectOwnership><value>D</value></directOrIndirectOwnership><natureOfOwnership><value/></natureOfOwnership></ownershipNature></derivativeHolding><derivativeHolding><securityTitle><value>Options (Option to Purchase)</value></securityTitle><conversionOrExercisePrice><value>.47</value></conversionOrExercisePrice><exerciseDate><value>2003-02-13</value></exerciseDate><expirationDate><value>2013-02-13</value></expirationDate><underlyingSecurity><underlyingSecurityTitle><value>Common Stock</value></underlyingSecurityTitle><underlyingSecurityShares><value>5796</value><footnoteId id="F3"/></underlyingSecurityShares></underlyingSecurity><ownershipNature><directOrIndirectOwnership><value>D</value></directOrIndirectOwnership><natureOfOwnership><value/></natureOfOwnership></ownershipNature></derivativeHolding><derivativeHolding><securityTitle><value>Options (Option to Purchase)</value></securityTitle><conversionOrExercisePrice><value>.36</value></conversionOrExercisePrice><exerciseDate><value>2003-04-01</value></exerciseDate><expirationDate><value>2013-04-01</value></expirationDate><underlyingSecurity><underlyingSecurityTitle><value>Common Stock</value></underlyingSecurityTitle><underlyingSecurityShares><value>40000</value><footnoteId id="F3"/></underlyingSecurityShares></underlyingSecurity><ownershipNature><directOrIndirectOwnership><value>D</value></directOrIndirectOwnership><natureOfOwnership><value/></natureOfOwnership></ownershipNature></derivativeHolding><derivativeHolding><securityTitle><value>Options (Option to Purchase)</value></securityTitle><conversionOrExercisePrice><value>.36</value></conversionOrExercisePrice><exerciseDate><value>2003-04-01</value></exerciseDate><expirationDate><value>2013-04-01</value></expirationDate><underlyingSecurity><underlyingSecurityTitle><value>Common Stock</value></underlyingSecurityTitle><underlyingSecurityShares><value>5000</value><footnoteId id="F3"/></underlyingSecurityShares></underlyingSecurity><ownershipNature><directOrIndirectOwnership><value>D</value></directOrIndirectOwnership><natureOfOwnership><value/></natureOfOwnership></ownershipNature></derivativeHolding></derivativeTable><footnotes><footnote id="F1">These shares are owned jointly with Nancy Jablonski, Dr. Guenther's spouse.</footnote><footnote id="F2">40,000 shares of common stock were transferred from Registrant to four of Registrant's children (10,000 to each) under the UGMA.  Registrant disclaims beneficial ownership of these shares.</footnote><footnote id="F3">25% of these options vest quarterly over the one-year period from the date of grant.</footnote><footnote id="F4">The Warrants are owned by Mitchell A. Guenther, Stanley G. Jablonski, Natalie G. Jablonski, and Mack G. Jablonski (20,000 each) for which Registrant is custodian.  Registrant disclaims benefical ownership of these warrants.</footnote></footnotes><remarks/><ownerSignature><signatureName>Donald T. Locke, Attorney in Fact</signatureName><signatureDate>2003-11-05</signatureDate></ownerSignature></ownershipDocument>

