ENDescription
The mucus secreted by the mucous membranes of the respiratory passages, especially when produced in excessive quantities.
Related Subjects
The graph displays the other subjects mentioned on the same pages as the subject "Phlegm". If the same subject occurs on a page with "Phlegm" more than once, it appears closer to "Phlegm" on the graph, and is colored in a darker shade. The closer a subject is to the center, the more "related" the subjects are.