    <SEC-DOCUMENT>0001104659-24-126670-index.html : 20241209
    <SEC-HEADER>0001104659-24-126670.hdr.sgml : 20241209
    <ACCEPTANCE-DATETIME>20241209130319
    ACCESSION NUMBER:		0001104659-24-126670
    CONFORMED SUBMISSION TYPE:	N-CSR
    PUBLIC DOCUMENT COUNT:		17
    CONFORMED PERIOD OF REPORT:	20240930
    FILED AS OF DATE:		20241209
    DATE AS OF CHANGE:		20241209
    EFFECTIVENESS DATE:		20241209

    FILER:

    	COMPANY DATA:
    		COMPANY CONFORMED NAME:			abrdn Healthcare Investors
    		CENTRAL INDEX KEY:			0000805267
    		ORGANIZATION NAME:
    		IRS NUMBER:				046564285
    		STATE OF INCORPORATION:			MA
    		FISCAL YEAR END:			0930

    	FILING VALUES:
    		FORM TYPE:		N-CSR
    		SEC ACT:		1940 Act
    		SEC FILE NUMBER:	811-04889
    		FILM NUMBER:		241534578

    	BUSINESS ADDRESS:
    		STREET 1:		1900 MARKET STREET
    		STREET 2:		SUITE 200
    		CITY:			PHILADELPHIA
    		STATE:			PA
    		ZIP:			19103
    		BUSINESS PHONE:		6177728515

    	MAIL ADDRESS:
    		STREET 1:		1900 MARKET STREET
    		STREET 2:		SUITE 200
    		CITY:			PHILADELPHIA
    		STATE:			PA
    		ZIP:			19103

    	FORMER COMPANY:
    		FORMER CONFORMED NAME:	TEKLA HEALTHCARE INVESTORS
    		DATE OF NAME CHANGE:	20141015

    	FORMER COMPANY:
    		FORMER CONFORMED NAME:	H&Q HEALTHCARE INVESTORS
    		DATE OF NAME CHANGE:	19920703
    </SEC-HEADER>
    <DOCUMENT>
    <TYPE>N-CSR
    <SEQUENCE>1
    <FILENAME>tm2430035d5_ncsr.htm
    <DESCRIPTION>N-CSR
    <TEXT>
    Document 1 - file: tm2430035d5_ncsr.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EX-99.CODEETH
    <SEQUENCE>2
    <FILENAME>tm2430035d5_ex99-codeeth.htm
    <DESCRIPTION>EXHIBIT 99.CODEETH
    <TEXT>
    Document 2 - file: tm2430035d5_ex99-codeeth.htm

    </DOCUMENT>
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    <TYPE>EX-99.CERT
    <SEQUENCE>3
    <FILENAME>tm2430035d5_ex99-cert.htm
    <DESCRIPTION>EXHIBIT 99.CERT
    <TEXT>
    Document 3 - file: tm2430035d5_ex99-cert.htm

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    <DOCUMENT>
    <TYPE>EX-99.906CERT
    <SEQUENCE>4
    <FILENAME>tm2430035d5_ex99-906cert.htm
    <DESCRIPTION>EXHIBIT 99.906CERT
    <TEXT>
    Document 4 - file: tm2430035d5_ex99-906cert.htm

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    <SEQUENCE>5
    <FILENAME>tm2430035d5_ex99-xcx1.htm
    <DESCRIPTION>EXHIBIT 99.(C)(1)
    <TEXT>
    Document 5 - file: tm2430035d5_ex99-xcx1.htm

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    <DOCUMENT>
    <TYPE>EX-99.(C)(2)
    <SEQUENCE>6
    <FILENAME>tm2430035d5_ex99-xcx2.htm
    <DESCRIPTION>EXHIBIT 99.(C)(2)
    <TEXT>
    Document 6 - file: tm2430035d5_ex99-xcx2.htm

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    <TYPE>EX-99.(D)
    <SEQUENCE>7
    <FILENAME>tm2430035d5_ex99-xd.htm
    <DESCRIPTION>EXHIBIT 99.(D)
    <TEXT>
    Document 7 - file: tm2430035d5_ex99-xd.htm

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    <TYPE>EX-99.(E)
    <SEQUENCE>8
    <FILENAME>tm2430035d5_ex99-xe.htm
    <DESCRIPTION>EXHIBIT 99.(E)
    <TEXT>
    Document 8 - file: tm2430035d5_ex99-xe.htm

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    <SEQUENCE>9
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    Document 12 - file: tm2430035d5hqhreporti004.jpg

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    Document 13 - file: tm2430035d5hqhreporti005.jpg

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    <SEQUENCE>14
    <FILENAME>tm2430035d5_ex99-xcx1img001.jpg
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    <TEXT>
    Document 14 - file: tm2430035d5_ex99-xcx1img001.jpg

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    <SEQUENCE>15
    <FILENAME>tm2430035d5_ex99-xcx1img002.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 15 - file: tm2430035d5_ex99-xcx1img002.jpg

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    <SEQUENCE>16
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    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 16 - file: tm2430035d5_ex99-xcx2img001.jpg

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    <SEQUENCE>17
    <FILENAME>tm2430035d5_ex99-xcx2img002.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 17 - file: tm2430035d5_ex99-xcx2img002.jpg

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