Skip Navigation Bar

What's New in MeSH

2019 MeSH Descriptor Preview Files are now Available

We have completed our work on the 2019 MeSH Descriptor production release. You can now view 2019 MeSH headings using the 2019 MeSH Preview Browser. Our Files Available to Download page also has a variety of reports showing the terminology changes we made for 2019 MeSH.

Please note that these files are not yet finalized and there may be be minor changes to the MeSH prior to the full release in November 2018.

MeSH is now available in Resource Definition Format (RDF)

MeSH RDF is a linked data representation of the MeSH biomedical vocabulary produced by the National Library of Medicine. MeSH RDF is distributed as a downloadable file in RDF N-Triples format. We also provide a SPARQL query editor, a SPARQL endpoint (API), and a RESTful interface for retrieving MeSH data. Note that we will also continue distribution of XML, ASCII, and MeSH/MARC formats.

MeSH on Demand Version 2.0

MeSH on Demand (MOD) is a web interface that uses the NLM's Medical Text Indexer (MTI) to identify MeSH Terms in text provided by the user. After processing, MeSH on Demand returns a list of MeSH Terms that match your text. The newly released 2.0 version of MeSH on Demand was created in response to suggestions and comments from a variety of users. The redesign has a new appearance and several new features. Please see our MOD New Features page for more information.

The MeSH Browser has been upgraded.

Our programmers have totally redesigned and rebuilt it on a new more powerful platform.

  • Summary of new and different functionalities of the new MeSH Browser
    • The following options and controls are now listed along the top MeSH Bar on every page
      • Search (formerly: “Return to Entry Page”)
      • Tree View (formerly: “Navigate from tree top”)
      • MeSH Suggestions (formerly: "MeSH vocabulary suggestions")
      • MeSH on Demand (formerly found next to search options)
      • MeSH 2015 or other alternate MeSH year (formerly: "Go to 2015 MeSH")
      • Contact Us (formerly found at the very bottom of the page)
    • Search mode choice and differences between Full Word and Substring search
      • The Full Word search looks for complete words only, not strings that are part of a word, term, or sentence.
      • Substring search is most similar to the current MeSH Browser. It searches for a string of characters that are a complete term or are within a sentence or within another word.
    • Search Results
      • In the new MeSH Browser you have the choice of seeing the search results sorted by “Relevance” or “Name” (alphabetically by the name of the record that contains the Term found by the search). Inomparison the current browser search results are listed alphabetically by the Term found by the search
      • The new MeSH Browser now offers you have the choice of seeing either 20 or 1000 records per page.
    • Record Display Improvements
      • Order of Fields in Main MeSH Descriptor has been changed. The Unique Identifier is just below tree number rather than listed last, and the qualifier field is not listed but given its own subpage (tab).
      • There are now separate tabs for Qualifiers, MeSH Tree Structures, and Concept views.
      • Qualifier tab now shows both the spelled-out and the 2-letter abbreviations.
      • The NLM Classification number is now shown when a MeSH term points to a single number in the NLM Classification.
    • Concepts View
      • The Concepts View has been simplified to one page that can be expanded or collapsed by clicking on the "Expand All/Collapse All" button, or by clicking on Concept terms (Preferred, Narrower, Broader or Related) or any of the entry Terms in each concept. In comparison the current MeSH Browser has three different record views.
      • The Concept Unique Identifiers (UIs) link to MeSH RDF data. For more information see: MeSH RDF Linked Data (beta) service from NLM
    • Viewing MeSH Trees
      • There are now two ways to browse in the Tree View.
        • Click on the plus sign (+) to expand the tree at a specific node. Note that the expanded node is now displayed within the context of the entire hierarchy and all nodes above your expansion point are available for navigation on your screen.
        • Click on the MeSH term to go to the MeSH Descriptor record for that tree node.