Is dry mouth a symptom of sinusitis?

Hello, Anon.

Thank you for writing.

It can be. Breathing from your mouth because of nasal congestion - from a cold, allergies or sinus infection - can cause a dry mouth (and throat). Snoring, a deviated septum and nasal polyps are other causes, where mouth breathing is common.  Antihistamines and decongestants can also cause dryness when treating stuffy noses.  If your dry mouth continues even after your infection clears, see your doctor as something else might be causing your dry mouth. 

best,

Helena