    <SEC-DOCUMENT>0001193125-20-239752-index.html : 20200904
    <SEC-HEADER>0001193125-20-239752.hdr.sgml : 20200904
    <ACCEPTANCE-DATETIME>20200904111412
    ACCESSION NUMBER:		0001193125-20-239752
    CONFORMED SUBMISSION TYPE:	N-CSRS
    PUBLIC DOCUMENT COUNT:		19
    CONFORMED PERIOD OF REPORT:	20200630
    FILED AS OF DATE:		20200904
    DATE AS OF CHANGE:		20200904
    EFFECTIVENESS DATE:		20200904

    FILER:

    	COMPANY DATA:
    		COMPANY CONFORMED NAME:			BlackRock Health Sciences Trust
    		CENTRAL INDEX KEY:			0001314966
    		IRS NUMBER:				000000000
    		STATE OF INCORPORATION:			DE

    	FILING VALUES:
    		FORM TYPE:		N-CSRS
    		SEC ACT:		1940 Act
    		SEC FILE NUMBER:	811-21702
    		FILM NUMBER:		201161134

    	BUSINESS ADDRESS:
    		STREET 1:		100 BELLEVUE PARKWAY
    		CITY:			WILMINGTON
    		STATE:			DE
    		ZIP:			19809
    		BUSINESS PHONE:		(888) 825-2257

    	MAIL ADDRESS:
    		STREET 1:		100 BELLEVUE PARKWAY
    		CITY:			WILMINGTON
    		STATE:			DE
    		ZIP:			19809
    </SEC-HEADER>
    <DOCUMENT>
    <TYPE>N-CSRS
    <SEQUENCE>1
    <FILENAME>d906080dncsrs.htm
    <DESCRIPTION>BLACKROCK HEALTH SCIENCES TRUST
    <TEXT>
    Document 1 - file: d906080dncsrs.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EX-99.CERT
    <SEQUENCE>2
    <FILENAME>d906080dex99cert.htm
    <DESCRIPTION>CERTIFICATION PURSUANT TO SECTION 302
    <TEXT>
    Document 2 - file: d906080dex99cert.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EX-99.906CERT
    <SEQUENCE>3
    <FILENAME>d906080dex99906cert.htm
    <DESCRIPTION>CERTIFICATION PURSUANT TO SECTION 906
    <TEXT>
    Document 3 - file: d906080dex99906cert.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EX-99.NOTICE
    <SEQUENCE>4
    <FILENAME>d906080dex99notice.htm
    <DESCRIPTION>SECTION 19 NOTICE
    <TEXT>
    Document 4 - file: d906080dex99notice.htm

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    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>5
    <FILENAME>g842776photo_01mips.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 5 - file: g842776photo_01mips.jpg

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    <DESCRIPTION>GRAPHIC
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    Document 6 - file: g842776sig_01mips.jpg

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    <DESCRIPTION>GRAPHIC
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    Document 7 - file: g906013g05c91.jpg

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    <SEQUENCE>8
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    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 8 - file: g906013g10o63.jpg

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    <SEQUENCE>9
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    <DESCRIPTION>GRAPHIC
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    Document 9 - file: g906013g15e89.jpg

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    <SEQUENCE>10
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    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 10 - file: g906013g19q04.jpg

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    <SEQUENCE>11
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    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 11 - file: g906013g33p40.jpg

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    <SEQUENCE>12
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    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 12 - file: g906013g42l24.jpg

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    <SEQUENCE>13
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    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 13 - file: g906013g58v23.jpg

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    <SEQUENCE>14
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    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 14 - file: g906013g65o19.jpg

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    <SEQUENCE>15
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    <DESCRIPTION>GRAPHIC
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    Document 15 - file: g906013g65r93.jpg

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    <SEQUENCE>16
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    <DESCRIPTION>GRAPHIC
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    Document 16 - file: g906013g71u37.jpg

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    <SEQUENCE>17
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    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 17 - file: g906013g87v86.jpg

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    <TYPE>GRAPHIC
    <SEQUENCE>18
    <FILENAME>g906013g94h23.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 18 - file: g906013g94h23.jpg

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    <DOCUMENT>
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    <SEQUENCE>19
    <FILENAME>g906013leaf.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 19 - file: g906013leaf.jpg

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    </SEC-DOCUMENT>