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

    <schemaVersion>X0202</schemaVersion>

    <documentType>3</documentType>

    <periodOfReport>2004-08-31</periodOfReport>

    <noSecuritiesOwned>0</noSecuritiesOwned>

    <issuer>
        <issuerCik>0000353191</issuerCik>
        <issuerName>NORTH VALLEY BANCORP</issuerName>
        <issuerTradingSymbol>NOVB</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001301892</rptOwnerCik>
            <rptOwnerName>Perry John</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>350 COURT STREET</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>WOODLAND</rptOwnerCity>
            <rptOwnerState>CA</rptOwnerState>
            <rptOwnerZipCode>95695</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>1</isOther>
            <otherText>Director of Subsidiary Corp.</otherText>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable>
        <nonDerivativeHolding>
            <securityTitle>
                <value>Common</value>
            </securityTitle>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>25583</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value></value>
                </natureOfOwnership>
            </ownershipNature>
        </nonDerivativeHolding>
    </nonDerivativeTable>

    <footnotes></footnotes>

    <remarks>The Reporting Person became subject to Section 16(a) as a result of the acquisition of Yolo Community Bank by North Valley Bancorp, consummated effective August 31, 2004.  The acquisition consideration to be paid to shareholders of Yolo Community Bank is a combination of cash and shares of North Valley Bancorp common stock, subject to the election and allocation procedures set forth in the Agreement and Plan of Reorganization and Merger dated April 23, 2004, executed between Yolo Community Bank and North Valley Bancorp.  The number of shares shown in Table I, Item 2 of this Form 3 is the estimated maximum amount that may be allocated to the Reporting Person under such procedures (which will be administered by the exchange agent for North Valley Bancorp following the closing on August 31, 2004).  Accordingly, Table I, Item 2 of this Form 3 will be amended to show the actual number of shares beneficially owned by the Reporting Person, upon completion of the election and allocation procedures.</remarks>

    <ownerSignature>
        <signatureName>John Perry</signatureName>
        <signatureDate>2004-09-10</signatureDate>
    </ownerSignature>
</ownershipDocument>

