Every year, the National Library of Medicine evaluates its Medical Subject Headings to see if any changes are needed. MeSH is the National Library of Medicine’s controlled vocabulary thesaurus. MeSH terms are used to index the literature that NLM receives from 5,400 journals on medical subjects. There are 26,853 descriptors in the 2013 MeSH to help you narrow your research to your topic.
New MeSH terms to be added in 2013 include air filters, health impact assessment, organophosphate poisoning, ozone depletion, public health surveillance, and return to work, among many others.
See lists of the changes to MeSH terms for 2013 and to read more about MeSH terms in general.