"Headache" is a descriptor in the National Library of Medicine's controlled vocabulary thesaurus, MeSH (Medical Subject Headings). Descriptors are arranged in a hierarchical structure, which enables searching at various levels of specificity.
MeSH information
The symptom of PAIN in the cranial region. It may be an isolated benign occurrence or manifestation of a wide variety of HEADACHE DISORDERS.

This graph shows the total number of publications written about "Headache" by people in this website by year, and whether "Headache" was a major or minor topic of these publications.
Bar chart showing 2575 publications over 31 distinct years, with a maximum of 188 publications in 2015
To see the data from this visualization as text, click here.