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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.

Explore MeSH Vocabulary


What's New

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

  • New FTP site! MeSH files from 1999-present are now available via a simple FTP file structure
  • Mid-Year Update- New Zika Virus headings added to MeSH

Zika Virus
Aedes mosquito: Pan American Health Organization


Obtain MeSH Data

Learn About MeSH


MeSH Pharmaceutical Databases

  • 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


Related MeSH Efforts


User Input and Suggestions