Symptoms of oral dryness are mainly bitter taste in the mouth and difficulty in swallowing. 1. Usually patients with dry mouth will have bitter taste in mouth, dry and cracked lips, peeling skin, corners of the mouth are easy to dry and cracked, etc. Severe patients may also have dental caries, dysphagia, etc., accompanied by dry skin, dry eyes, dry throat, etc.; a small number of patients may also have skin flaking, dry eyes without tears, corneal dryness and other symptoms. 2. Patients can take medication or general treatment under the guidance of a doctor; for example, glucocorticosteroids such as prednisone and hydrocortisone can be taken under the guidance of a doctor, and patients should eat less of high-oil, high-fat, spicy and irritating foods. Usually should drink more water to keep the mouth moist, eat more vegetables and fruits rich in vitamins. It is recommended that the patient be diagnosed and treated symptomatically, do not self-medication, in order to avoid adverse reactions.