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.

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Based on: Post-Nasal Catarrh and Diseases of the Nose Causing Deafness. By Edward Woakes, M. D., Senior Aural Surgeon and Lecturer on Diseases of the Ear, London Hospital, Senior Surgeon Hospital for ...

Based on: A Practical Treatise on Nasal Catarrh and Allied Diseases. By Beverly Robinson, A.M., M.D., (Paris), Clinical Professor of Medicine at the Bellevue Hospital ...

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