What is MeSH?
MeSH, which stands for Medical Subject Headings, is a controlled vocabulary of biomedical terms used for indexing documents in MEDLINE. MeSH was developed and is maintained by the National Library of Medicine, the producer of MEDLINE. You must use subject headings to search the MeSH Terms field in MEDLINE. Qualifiers, also known as subheadings, are controlled terms that qualify or add context to subject headings. The MeSH thesaurus also contains non-preferred or entry terms that serve as access points to subject headings.