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Welcome to Medical Subject Headings!

The NLM's curated medical vocabulary resource.

Our main purpose is to provide a hierarchically-organized terminology for indexing and cataloging of biomedical information such as MEDLINE/PUBmed and other NLM databases. We also distribute pharmaceutical information through our RxNorm database, and manage the curation of the UMLS and SnoMed database.


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What's New

Visit our What's New page to see all recent MeSH developments including the most recent ones listed below

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Learn About MeSH

Related MeSH Efforts

  • RxNorm: A drug vocabulary used for e-prescribing, formulary, medication history, government reporting, drug compendia mapping, and other uses
  • Daily Med: Provides trustworthy information about marketed drugs in the United States
  • Unified Medical Language System (UMLS®) Metathesaurus: A collection of biomedical names and codes grouped as sets of synonyms, derived from over 150 medical vocabulary sources.
  • NLM Classification: A NLM vocabulary used for the arrangement of library materials in the field of medicine and related sciences.

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