<?xml version="1.0"?>
<ownershipDocument>
    <schemaVersion>X0101</schemaVersion>

    <documentType>3</documentType><periodOfReport>2003-05-28</periodOfReport>
    <noSecuritiesOwned>0</noSecuritiesOwned>

    <issuer>
        <issuerCik>0001127703</issuerCik>
        <issuerName>PROASSURANCE CORP</issuerName>
        <issuerTradingSymbol>PRA</issuerTradingSymbol></issuer><reportingOwner><reportingOwnerId>
            <rptOwnerCik>0001237394</rptOwnerCik>
            <rptOwnerName>YEARGAN WILFRED W</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>  </rptOwnerStreet1>
            <rptOwnerStreet2>  </rptOwnerStreet2>
            <rptOwnerCity>  </rptOwnerCity>
            <rptOwnerState>  </rptOwnerState>
            <rptOwnerZipCode>  </rptOwnerZipCode>
        </reportingOwnerAddress>
            <reportingOwnerRelationship>
<isDirector>1</isDirector><isOfficer>0</isOfficer><isTenPercentOwner>0</isTenPercentOwner><isOther>0</isOther></reportingOwnerRelationship></reportingOwner><nonDerivativeSecurity><securityTitle><value>Common Stock</value></securityTitle><transactionAmounts><transactionShares><value>4812</value></transactionShares></transactionAmounts><ownershipNature><directOrIndirectOwnership><value>I</value><footnoteId id="F1"/></directOrIndirectOwnership><natureOfOwnership><value>Deferred Compensation Plan</value></natureOfOwnership></ownershipNature></nonDerivativeSecurity><footnotes><footnote id="F1">Shares due to the Reporting Person under provisions of the Medical Assurance, Inc. Deferred Compensation Plan. Shares awarded for prior service.</footnote></footnotes><ownerSignature><signatureName>Frank B. O'Neil, Power of Attorney</signatureName><signatureDate>2003-06-11</signatureDate></ownerSignature></ownershipDocument>

