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

    <schemaVersion>X0202</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2007-03-09</periodOfReport>

    <notSubjectToSection16>0</notSubjectToSection16>

    <issuer>
        <issuerCik>0001233426</issuerCik>
        <issuerName>NationsHealth, Inc.</issuerName>
        <issuerTradingSymbol>NHRX</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001302788</rptOwnerCik>
            <rptOwnerName>GRH Holdings, L.L.C.</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>6701 NOB HILL ROAD</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>TAMARAC</rptOwnerCity>
            <rptOwnerState>FL</rptOwnerState>
            <rptOwnerZipCode>33321</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001303137</rptOwnerCik>
            <rptOwnerName>Viaura Holdings, Ltd.</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>C/O GRH HOLDINGS, L.L.C.</rptOwnerStreet1>
            <rptOwnerStreet2>6701 NOB HILL ROAD</rptOwnerStreet2>
            <rptOwnerCity>TAMARAC</rptOwnerCity>
            <rptOwnerState>FL</rptOwnerState>
            <rptOwnerZipCode>33321</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001303143</rptOwnerCik>
            <rptOwnerName>Viaura, Inc.</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>C/O GRH HOLDINGS, L.L.C.</rptOwnerStreet1>
            <rptOwnerStreet2>6701 NOB HILL ROAD</rptOwnerStreet2>
            <rptOwnerCity>TAMARAC</rptOwnerCity>
            <rptOwnerState>FL</rptOwnerState>
            <rptOwnerZipCode>33321</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001303148</rptOwnerCik>
            <rptOwnerName>Gusky Michael</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>C/O GRH HOLDINGS, L.L.C.</rptOwnerStreet1>
            <rptOwnerStreet2>6701 NOB HILL ROAD</rptOwnerStreet2>
            <rptOwnerCity>TAMARAC</rptOwnerCity>
            <rptOwnerState>FL</rptOwnerState>
            <rptOwnerZipCode>33321</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001303160</rptOwnerCik>
            <rptOwnerName>Gusky Robin</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>C/O GRH HOLDINGS, L.L.C.</rptOwnerStreet1>
            <rptOwnerStreet2>6701 NOB HILL ROAD</rptOwnerStreet2>
            <rptOwnerCity>TAMARAC</rptOwnerCity>
            <rptOwnerState>FL</rptOwnerState>
            <rptOwnerZipCode>33321</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Common Stock, par value $0.0001 per share</value>
            </securityTitle>
            <transactionDate>
                <value>2007-03-09</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>S</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionTimeliness>
                <value></value>
            </transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
                    <value>540</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>1.5</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>D</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>5082823</value>
                    <footnoteId id="F1"/>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                    <footnoteId id="F1"/>
                </directOrIndirectOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
    </nonDerivativeTable>

    <footnotes>
        <footnote id="F1">The Common Stock, par value $0.0001 per share, is owned by GRH Holdings, L.L.C., but may also be deemed to be beneficially owned by (a) Viaura Holdings, Ltd. which is the managing member of GRH Holdings, L.L.C., (b) Viaura, Inc., which is the general partner of Viaura Holdings, Ltd., and (c) Michael Gusky and Robin Gusky, which are the holders of a majority of the issued and outstanding stock of Viaura, Inc. Each of Viaura Holdings, Ltd., Viaura, Inc. and Michael Gusky and Robin Gusky expressly disclaims beneficial ownership of any shares of Common Stock held by GRH Holdings, L.L.C., except to the extent of its, her or his pecuniary interest in them.</footnote>
    </footnotes>

    <ownerSignature>
        <signatureName>Michael Gusky, President</signatureName>
        <signatureDate>2007-03-13</signatureDate>
    </ownerSignature>

    <ownerSignature>
        <signatureName>Micheal Gusky, President</signatureName>
        <signatureDate>2007-03-13</signatureDate>
    </ownerSignature>

    <ownerSignature>
        <signatureName>Michael Gusky</signatureName>
        <signatureDate>2007-03-13</signatureDate>
    </ownerSignature>

    <ownerSignature>
        <signatureName>Robin Gusky</signatureName>
        <signatureDate>2007-03-13</signatureDate>
    </ownerSignature>
</ownershipDocument>
