"Empathy" 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
An individual's objective and insightful awareness of the feelings and behavior of another person. It should be distinguished from sympathy, which is usually nonobjective and noncritical. It includes caring, which is the demonstration of an awareness of and a concern for the good of others. (From Bioethics Thesaurus, 1992)

This graph shows the total number of publications written about "Empathy" by people in this website by year, and whether "Empathy" was a major or minor topic of these publications.
Bar chart showing 1442 publications over 29 distinct years, with a maximum of 150 publications in 2017
To see the data from this visualization as text, click here.