That persistent feeling of mucus dripping down the back of your throat or constant need to clear your nose isn’t just annoying — it’s a condition called catarrh that affects millions of Americans.

Based on: Autumnal Catarrh (Hay Fever), with Illustrative Maps. By Morrill Wyman, M. D., late Hersey Professor Adjunct of the Theory and Practice of Medicine in Harvard University, etc., etc. New York ...