See more search examples and find resources for PubMed Training.
Understanding how to correctly use Boolean operators to construct your search is important!
AND | Narrows search to only items containing both terms; best for combining 2 concepts | heart attack AND aspirin |
OR | Broadens search to items containing any terms; best for combining synonyms | heart attack OR myocardial infarction |
NOT | Narrows search to items containing 1 term but not another; use with caution | dolphins NOT football |