PubMed is a free bibliographic database that comprises more that 20 million citations for biomedical literature from MEDLINE, life science journals, and online books. It is produced and maintained by the US National Library of Medicine (the world's largest medical library).
Medical Subject Headings (or MeSH) is a controlled vocabulary used to index articles in PubMed. Using MeSH to develop your search means you do not need to worry about synonyms and spelling variations and will increase the relevancy of your results.
Below is a short video (~3mins) demonstrating how to do a search in PubMed using MeSH. Note that the PubMed homepage has been updated, but the process is the same.
National Library of Medicine, (2013, February 14).
It's important to compliment your MeSH search with keywords for the following reasons:
When brainstorming keywords, it's important to consider variant spellings, synonyms, and plural forms.
Below is a short video (~7mins) showing you how to search PubMed using keywords.
National Library of Medicine. (2020, July 27). PubMed: Using the advanced search builder [Video file]. Retrieved from https://youtu.be/IHhTDqiNQK8.