Dry thirst often occurs in the throat for reasons such as diabetes, viral colds, vitamin C deficiency, and low indoor humidity. Diabetic patients can take away more water because of glucose loss from urine and produce symptoms of irritable thirst because of water deficiency. Colds and fever can lead to loss of water through breathing and skin, resulting in dry throat and sore throat. Usually eating less vegetables and fruits and not enough vitamin C affects the mucous membrane function of the nasopharynx, causing dry throat and thirst. Insufficient indoor humidity and dry air, the nasopharynx needs to secrete more water when breathing to moisten the air and appear thirsty. You can check blood sugar, blood routine, vitamin C level measurement to exclude diabetes, cold and vitamin C deficiency, dry air can pay attention to indoor humidification to see if it can be improved, adenoid hypertrophy because of poor respiratory ventilation, open mouth breathing at night will also have a dry and itchy throat and thirst.