Mesh stands for Medical Subject Headings and is Pubmed's MEDLINE controlled vocabulary. Not all articles in Pubmed will contain MeSH terms.
TIP: To view the National Library of Medicine's MeSH tutorial, click HERE.
To look up if a MeSH term exists, choose "MeSH" from the search bar's drop down on the main page then type in your word or term. Click search.

The below image shows MeSH within an article. If the article provides MeSH terms, you can view them below the abstract.
