Medical Subject Headings

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2012 MeSH
- These formatted versions of the entire MeSH vocabulary are available to download.
  - 2012 XML MeSH
    - Descriptor Records
      - Compressed files ZIP file [15MB] GZ file [15MB]
      - XML file (updated weekly) [288MB, uncompressed, takes longer to download], DTD
    - Qualifier Records XML file (updated weekly) [475KB, uncompressed], DTD
    - Supplementary Concept Records (formerly Supplementary Chemical Records)
      - Compressed files ZIP file [39MB] GZ file [39MB]
      - XML file (updated weekly) [638MB, uncompressed, takes longer to download], DTD
  - 2012 ASCII MeSH
    - Descriptor Records [28MB]
    - Qualifier Records [97KB]
    - Supplementary Concept Records [78MB]
      (formerly Supplementary Chemical Records)
  - 2012 MeSH Trees [2.1MB]
  - 2012 MeSH in MARC format
- These files are also available for 2012 MeSH:
  - Substances with a given Pharmacologic Action - 2012 [3.6MB, XML format], DTD
  - New Headings with Scope Notes - 2012 [140KB]
  - Replaced Headings - 2012 [4KB]
  - 2012 Descriptors - preferred term only [490KB]
  - MN (tree number) Changes - 2012 [150KB]

2011 MeSH
- 2011 XML MeSH
  - Descriptor Records
    - Compressed files ZIP file [15MB] GZ file [15MB]
    - XML file [283MB, uncompressed]
  - Qualifier Records XML file [474KB, uncompressed]
  - Supplementary Concept Records (formerly Supplementary Chemical Records)
    - Compressed files ZIP file [44MB] GZ file [44MB]
    - XML file [638MB, uncompressed]
- 2011 ASCII MeSH
  - Descriptor Records [27MB]
  - Qualifier Records [96KB]
  - Supplementary Concept Records [78MB]
    (formerly Supplementary Chemical Records)
- 2011 MeSH Trees [2MB]
- 2011 MeSH in MARC format
- This file is also available for 2011 MeSH:
  - Substances with a given Pharmacologic Action - 2011 [3.3MB, XML format], DTD

2010 MeSH
- 2010 MeSH in MARC format

2004 MeSH
- 2004 MeSH files for TREC (Text REtrieval Conference) Genomics track
  
  The following files were preserved for use by the TREC community with the 2004 MEDLINE/PubMed Baseline. The files were downloaded when the 2004 MEDLINE/PubMed Baseline was created and represent the closest MeSH Vocabulary files for use with the data contained in the Baseline. For information about both the ASCII format and XML format, as well as sample files, see the information page for files available to download.
  - 2004_MEDLINE_Baseline_MeSH_ASCII.tar.gz [18MB]
    Compressed tar file containing the MeSH ASCII files that were preserved including:
    - c2004.bin - Supplementary Concept Records data elements
    - d2004.bin - Descriptor data elements
    - q2004.bin - Qualifier data elements
    - mtrees2004.bin - MeSH main headings with the MeSH tree codes that place the heading in a hierarchical arrangement.
  - 2004_MEDLINE_Baseline_MeSH_XML.tar.gz [44MB], DTD
    Compressed tar file containing the MeSH XML files that were preserved including:
    - supp2004.xml - Supplementary Concept Records data elements
    - desc2004.xml - Descriptor data elements
    - qual2004.xm - Qualifier data elements