Use the MeSH database to identify needed heading/subheading combinations
Remember the link to the MeSH database appears under "More Resources" in the horizontal, gray band at the top of the screen.
You must search for one heading at a time, but, when you find the needed heading, you can choose multiple subheadings and add them to the PubMed Search Builder simultaneously. The PubMed Search Builder will OR the simultaneously added heading/subheading combinations together automatically.
If you're having trouble remembering the steps involved in finding and selecting MeSH heading/subheading combinations click here.