    <SEC-DOCUMENT>0001193125-20-064488-index.html : 20200306
    <SEC-HEADER>0001193125-20-064488.hdr.sgml : 20200306
    <ACCEPTANCE-DATETIME>20200306114127
    ACCESSION NUMBER:		0001193125-20-064488
    CONFORMED SUBMISSION TYPE:	N-CSR
    PUBLIC DOCUMENT COUNT:		24
    CONFORMED PERIOD OF REPORT:	20191231
    FILED AS OF DATE:		20200306
    DATE AS OF CHANGE:		20200306
    EFFECTIVENESS DATE:		20200306

    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-CSR
    		SEC ACT:		1940 Act
    		SEC FILE NUMBER:	811-21702
    		FILM NUMBER:		20693347

    	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-CSR
    <SEQUENCE>1
    <FILENAME>d828801dncsr.htm
    <DESCRIPTION>BLACKROCK HEALTH SCIENCES TRUST
    <TEXT>
    Document 1 - file: d828801dncsr.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EX-99.CERT
    <SEQUENCE>2
    <FILENAME>d828801dex99cert.htm
    <DESCRIPTION>CERTIFICATION PURSUANT TO SECTION 302
    <TEXT>
    Document 2 - file: d828801dex99cert.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EX-99.906CERT
    <SEQUENCE>3
    <FILENAME>d828801dex99906cert.htm
    <DESCRIPTION>CERTIFICATION PURSUANT TO SECTION 906
    <TEXT>
    Document 3 - file: d828801dex99906cert.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EX-99.NOTICE
    <SEQUENCE>4
    <FILENAME>d828801dex99notice.htm
    <DESCRIPTION>SECTION 19 NOTICE
    <TEXT>
    Document 4 - file: d828801dex99notice.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EX-99.PROXY.POL
    <SEQUENCE>5
    <FILENAME>d828801dex99proxypol.htm
    <DESCRIPTION>CLOSED END PROXY VOTING POLICY
    <TEXT>
    Document 5 - file: d828801dex99proxypol.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EX-99.CORP.GOV
    <SEQUENCE>6
    <FILENAME>d828801dex99corpgov.htm
    <DESCRIPTION>GLOBAL CORPORATE GOVERNANCE GUIDELINES & ENGAGEMENT PRINCIPLES
    <TEXT>
    Document 6 - file: d828801dex99corpgov.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>7
    <FILENAME>g828798photo_01mips.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 7 - file: g828798photo_01mips.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>8
    <FILENAME>g828798sig_01mips.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 8 - file: g828798sig_01mips.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>9
    <FILENAME>g830968page16.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 9 - file: g830968page16.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>10
    <FILENAME>g830968page16a.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 10 - file: g830968page16a.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>11
    <FILENAME>g830968page17.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 11 - file: g830968page17.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>12
    <FILENAME>g830968page19.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 12 - file: g830968page19.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>13
    <FILENAME>g831012g05c91.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 13 - file: g831012g05c91.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>14
    <FILENAME>g831012g10o63.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 14 - file: g831012g10o63.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>15
    <FILENAME>g831012g15e89.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 15 - file: g831012g15e89.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>16
    <FILENAME>g831012g19q04.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 16 - file: g831012g19q04.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>17
    <FILENAME>g831012g33p40.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 17 - file: g831012g33p40.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>18
    <FILENAME>g831012g42l24.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 18 - file: g831012g42l24.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>19
    <FILENAME>g831012g58v23.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 19 - file: g831012g58v23.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>20
    <FILENAME>g831012g65o19.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 20 - file: g831012g65o19.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>21
    <FILENAME>g831012g65r93.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 21 - file: g831012g65r93.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>22
    <FILENAME>g831012g71u37.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 22 - file: g831012g71u37.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>23
    <FILENAME>g831012g94h23.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 23 - file: g831012g94h23.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>24
    <FILENAME>g831012leaf.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 24 - file: g831012leaf.jpg

    </DOCUMENT>
    </SEC-DOCUMENT>