PubMed Search Strategies for Beginners

This is a beginner's walk-through: you will take one clinical question, turn it into a first PubMed search, and improve it in a few rounds. For a fuller reference to fields, filters and syntax, see How to Search PubMed Effectively.

Step 1: Write your question and pick concepts

Question (invented for teaching): "In older adults with insomnia, does cognitive behavioural therapy reduce sleep problems compared with medication?" Concepts: older adults; insomnia; cognitive behavioural therapy. You can leave the comparison and outcome out of the search at first, because they are often inconsistently described.

Step 2: Make a first search

Type insomnia cognitive behavioral therapy older adults into PubMed. Note how many results you get and look at the first ten titles. Does it find relevant papers?

Step 3: Add synonyms

Add alternative terms in parentheses joined by OR: (insomnia OR "sleep disorder" OR "sleeplessness") AND ("cognitive behavioral therapy" OR CBT-I) AND (aged OR "older adults" OR elderly). Different authors use different words, and OR widens the net.

Step 4: Use MeSH terms

Open the MeSH database, search for "Sleep Initiation and Maintenance Disorders" and "Cognitive Behavioral Therapy", and add them to your search builder. MeSH terms retrieve papers about the concept even if the words differ.

Step 5: Check and refine

• Pick three papers you know are relevant; confirm that your search finds them.
• If you get thousands of results, add a concept or a filter (for example clinical trials).
• If you get few, remove the least important concept or add synonyms.

Illustrative example of a final check

You find 640 results. Ten random titles are all relevant to older adults and CBT for insomnia, and your three known papers appear. You save the search with its date and move on to screening.

Common pitfalls

• Using only one term per concept.
• Adding too many concepts at once (for example both intervention and outcome terms).
• Forgetting to note how you searched.

Key takeaways

• Start simple, add synonyms and MeSH, then test against papers you know.
• Save the final search and date.

This page is general educational information about research methods. It is not medical, legal or regulatory advice; follow your institution's ethics board and your target journal's instructions.