Subheadings are 2-letter codes used with MeSH terms to designate specific aspects of a subject.
Using a MeSH term in combination with a subheading is often the best way to search for broad subsets of a subject. Good examples of this are the subheadings SURGERY (SU) and DRUG THERAPY (DT) - If you're looking for articles on surgical or drug treatment of a particular disease, generally the best method is to search for the appropriate MeSH term with the attached subheading. [Hit RETURN] ...
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A list of Medline subheadings is on the bulletin board above station 1