Subject headings describe the content of each item in a database. Use these headings to find relevant items on the same topic. Searching by subject headings (a.k.a. descriptors) is the most precise way to search article databases. It is not always easy to guess which subject headings are used in a given database.
Keyword searching finds exact words or phrases, not concepts. It will not automatically search for related terms (e.g. high blood pressure vs. hypertension).
Key points about each type of search:
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Subjects
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Method 1: Look to see if the database has an online thesaurus to browse for subjects that match your topic.
Method 2: