Hello, Dry throat is a rough, scratchy, sometimes itchy feeling in the throat. The most common cause of dry throat is drying out of the mucus membranes, often as a result of exercise, sleeping with your mouth open, breathing through your mouth, living in a dry environment,sleeping in ac room or simply not drinking enough fluids. Drink plenty of water, or take frequent sips of water, Eat more fresh fruits. Which soothen your throat and controls itching.