New MeSH vocabulary is identified in one of three ways:
1. National Library of Medicine Indexers identify gaps in the vocabulary and forward the concepts to the MeSH staff.
2. NLM MeSH reviewers identify needed terms during the regular process of topic review.
3. Users alert the MeSH staff to new terms using the MeSH Suggestion page: https://www.nlm.nih.gov/mesh/meshsugg.html