Dry mouth, bitter mouth and phlegm in the throat may be related to bad dietary habits or due to chronic pharyngitis and other reasons. 1. Bad eating habits: If there are long-term bad eating habits, often too much to eat too greasy, spicy and stimulating food, coupled with too little water to drink, it is easy to cause dry mouth, bitter mouth, phlegm in the throat. 2. Chronic pharyngitis: chronic inflammatory stimulation of the upper respiratory tract, such as chronic sinusitis, nasopharyngeal inflammation, etc., can be due to its inflammatory secretion through the posterior nostrils to the posterior wall of the pharynx to stimulate the mucous membrane, can also be due to the patient’s long-term open-mouth breathing, resulting in mucosal over-drying and lead to chronic pharyngitis. Dry mouth and bitter mouth due to dryness, phlegm in the throat due to postnasal drip, may also be accompanied by coughing, itchy throat and other symptoms. Dry mouth and bitter throat with phlegm may also be caused by other reasons, if the symptoms are serious, you should seek medical attention as soon as possible.