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Search Field Tags

You can search specific fields of the PubMed record using PubMed's search field tags. A list of the available field names, tags, and brief field descriptions may be found in the PubMed Help under Search Field Descriptions and Tags.

  • Each search term should be followed (qualified) with the appropriate search field tag that indicates which field will be searched.

  • The search field tag must follow the term.

  • In the example, aromatherapy[mh] is correct and [mh] aromatherapy is incorrect.Graphic showing the example that aromatherapy[mh] is the correct way to use a search field tag and [mh] aromatherapy is incorrect

  • Tags are enclosed in square brackets.


  • Boolean operators -- AND, OR, NOT -- must be entered in uppercase letters.
  • Boolean operators are processed from left to right.
  • Use parentheses to nest terms together so they will be processed as a unit and then incorporated into the overall strategy.

Click on the links below to learn detailed information about these fields.

MeSH Headings [MH]
Subheadings [SH]
Pharmacologic Action [PA]
Text Words [TW]
Corporate Author [CN]
Personal Name as Subject [PS]
Place of Publication [PL]
Secondary Source Identifier [SI]
PubMed Unique Identifier [PMID]
Affiliation [AD]
Grant Number [GR]

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Last Reviewed: November 17, 2019