The MeSH Database lets you easily search for MeSH terms, use tools like subheadings, and build a search.
Access the MeSH Database by selecting "MeSH Database" from the "Explore" menu in the homepage.
Remember to search for one concept at a time:
Once you find a MeSH term you'd like to search, add it to the Search Builder. You can then search for more terms in MeSH Database, or Search PubMed.