-----BEGIN PRIVACY-ENHANCED MESSAGE-----
Proc-Type: 2001,MIC-CLEAR
Originator-Name: webmaster@www.sec.gov
Originator-Key-Asymmetric:
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 TWSM7vrzLADbmYQaionwg5sDW3P6oaM5D3tdezXMm7z1T+B+twIDAQAB
MIC-Info: RSA-MD5,RSA,
 KyWUSqY7ITBbxq+CDbOQeZ6WDRxwxXaAICBOhq9tx+etl3vSZ8+xAfrnOJuteuvI
 nQ/PaoKDPBM8tGP59hl0iw==

<SEC-DOCUMENT>0001019687-08-004776.txt : 20081103
<SEC-HEADER>0001019687-08-004776.hdr.sgml : 20081103
<ACCEPTANCE-DATETIME>20081103162939
ACCESSION NUMBER:		0001019687-08-004776
CONFORMED SUBMISSION TYPE:	4
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20081030
FILED AS OF DATE:		20081103
DATE AS OF CHANGE:		20081103

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			BIOMERICA INC
		CENTRAL INDEX KEY:			0000073290
		STANDARD INDUSTRIAL CLASSIFICATION:	DENTAL EQUIPMENT & SUPPLIES [3843]
		IRS NUMBER:				952645573
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			0531

	BUSINESS ADDRESS:	
		STREET 1:		1533 MONROVIA AVENUE
		CITY:			NEWPORT BEACH
		STATE:			CA
		ZIP:			92663
		BUSINESS PHONE:		9496452111

	MAIL ADDRESS:	
		STREET 1:		1533 MONROVIA AVENUE
		CITY:			NEWPORT BEACH
		STATE:			CA
		ZIP:			92663

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	NMS PHARMACEUTICALS INC
		DATE OF NAME CHANGE:	19871130

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	NUCLEAR MEDICAL SYSTEMS INC
		DATE OF NAME CHANGE:	19830216

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	NUCLEAR INSTRUMENTS INC
		DATE OF NAME CHANGE:	19720508

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			CANO FRANCIS
		CENTRAL INDEX KEY:			0001286710

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	000-08765
		FILM NUMBER:		081157845

	BUSINESS ADDRESS:	
		BUSINESS PHONE:		6509492216

	MAIL ADDRESS:	
		STREET 1:		11 ACORN LANE
		CITY:			LOS ALTOS
		STATE:			CA
		ZIP:			94022
</SEC-HEADER>
<DOCUMENT>
<TYPE>4
<SEQUENCE>1
<FILENAME>edgar.xml
<DESCRIPTION>PRIMARY DOCUMENT
<TEXT>
<XML>
<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0303</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2008-10-30</periodOfReport>

    <issuer>
        <issuerCik>0000073290</issuerCik>
        <issuerName>BIOMERICA INC</issuerName>
        <issuerTradingSymbol>BMRA.OB</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001286710</rptOwnerCik>
            <rptOwnerName>CANO FRANCIS</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>11 ACORN LANE</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>LOS ALTOS,</rptOwnerCity>
            <rptOwnerState>CA</rptOwnerState>
            <rptOwnerZipCode>94022</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>37000</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value></value>
                </natureOfOwnership>
            </ownershipNature>
        </nonDerivativeHolding>
    </nonDerivativeTable>

    <derivativeTable>
        <derivativeTransaction>
            <securityTitle>
                <value>Non-qualified Stock Option</value>
            </securityTitle>
            <conversionOrExercisePrice>
                <value>.75</value>
            </conversionOrExercisePrice>
            <transactionDate>
                <value>2008-10-30</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>A</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionAmounts>
                <transactionShares>
                    <value>25000</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>0</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>A</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <exerciseDate>
                <footnoteId id="F1"/>
            </exerciseDate>
            <expirationDate>
                <value>2018-10-30</value>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Common Stock</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>25000</value>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>110000</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value></value>
                </natureOfOwnership>
            </ownershipNature>
        </derivativeTransaction>
    </derivativeTable>

    <footnotes>
        <footnote id="F1">Exercisable one quarter immediately and one quarter on October 30, 2009, 2010 and 2011.</footnote>
    </footnotes>

    <remarks></remarks>

    <ownerSignature>
        <signatureName>/s/ Francis Cano</signatureName>
        <signatureDate>2008-10-31</signatureDate>
    </ownerSignature>
</ownershipDocument>
</XML>
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
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