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Use Filters	Limit your search by using the Filters on the Results page sidebar. Choose the restrictions for your search, e.g., a specific language, article type (e.g., randomized controlled trials, review), date, or subset of PubMed, e.g., nursing journals, cancer or bioethics. To limit to evidence-based citations see the Find Research Articles tab. Note: Filters remain in place until you change or remove them. Limits other than language or date will exclude NEW records that are "in process" or "supplied by Publisher."
Search by phrase (" ")	Add quotations around words to tell PubMed to find an exact phrase.
Search with wildcard (*)	Add an asterisk after a word or phrase to have PubMed fill in the end of the word with zero or more characters. E.g., child* searches for children OR child OR child's. Learn more about truncation and wildcards in PubMed.
Search for words in the title [ti]	Search for words in article titles [Do not use this for comprehensive searches.]    Ex: chlorhexidine[ti] AND bathing[ti]
Search by Author [au]	Search for a particular author    Ex: Flum DR[au]
Find Related Citations	Related articles, citations closely related to the original citation, are available in the Abstract view. These citations are displayed by relevancy and may be reviewed and added to the clipboard, saved or printed. Click on your result and see "Similar Articles" for suggestions.
Use Clinical Queries specialized searches to find evidence-based citations	Enter your search terms and evidence-filtered citations will appear under Clinical Study Categories. Systematic Reviews or Medical Genetics. The Clinical Queries link is found under More Resources at the top of the Advanced Search screen and on the PubMed home page.  See Find Research Articles tab for more information.
Construct a search using MeSH terms MeSH terms, Medical Subject Headings, are assigned to all indexed articles in PubMed; they are a key to finding relevant articles	Once you've identified an article that looks relevant, look at the article's MeSH terms. In the abstract view, click on the + next to Publication Types, MeSH terms Click on a term to add it to your PubMed search or to look it up in the MeSH database. Consider combining two or three MeSH terms.  Ex. "Precision Medicine"[Mesh] AND "Healthcare Disparities"[Mesh] You may add keywords to your search to narrow your results.
Use Advanced Search Builder	Click on Advanced below the PubMed search box. See MeSH/Advanced Search tab
Narrow or Broaden your search	See Hints for Improving Search Results below

For general information on searching in PubMed, see the Run a Search page.

No References or Too Few References

• Look for misspellings in your strategy.
• Decrease the number of concepts searched.
• Try a broader search term.
• Use a term from the thesaurus (i.e., MeSH or subject heading list) for searching. Select a citation of interest and click the title to see the Abstract Display (or select citations, add to the Clipboard, go to the Clipboard, and click Display Settings and change to abstract view). Below the abstract click the plus sign to the left of MeSH Terms, Substances. Click on Terms of interest and add search terms. For more information see the MeSH tab.
• Use the Related Articles feature.
• Check for missing or incorrect field qualifiers.
• Remove terms that are unlikely to be used by an author.
• Replace terms that are too general or too specific.
• Increase the number of synonyms or alternatives for a term.
• Use a truncation symbol at the end of a term to pick up variant endings.  The asterisk (*) is the truncation symbol used in PubMed.  Example:  asthm* will retrieve asthma or asthmatic.
• Try running the search on earlier years of the database.
• Try a different database.

Too Many References

• Choose the most specific subject headings or most significant key words.
• Use subheadings to narrow the focus of the subject heading if appropriate.
• Increase the number of search concepts that are ANDed together.
• Use fewer synonyms for terms.
• Make a term from the thesaurus (i.e. subject heading list or controlled vocabulary) the main focus of the article ("major" in PubMed).
• Limit to Review articles by using Filters.
• Limit your search to type of article, language, age group, current years, etc. by using Filters.
• Ask for significant words to be in the TITLE of the article.