A:
The most common cause of dry throat is dried out mucous membranes. This protective layer lines the throat, the respiratory and digestive tracts, and other areas. The throat can dry out from exercise, sleeping with your mouth open, breathing through your mouth, living in a dry environment, or not drinking enough fluids. Dry throat can be caused by tobacco or marijuana use, excessive coughing, allergies, medication side effect, and, in rare cases, throat and esophagus cancers.
