Feel thirsty in the morning is a normal physiological phenomenon. Because after a night’s sleep, through the sweat evaporation, exhaled gas evaporation will lose the body’s water, due to the night sleep did not replenish water, the body will enter a state of dehydration, then get up in the morning will feel thirsty. If the patient eats too salty at night and likes to eat heavy food, he will be relatively dehydrated in the morning and feel thirsty. If he suffers from Scheuglund’s syndrome or diabetes, hypertension and other diseases, he will easily feel thirsty in the morning, and if he snores in his sleep and breathes with his mouth open in the night, he will easily get thirsty in the morning because of the excessive liquid discharged from the lungs and mouth. If the patient himself has oral diseases, lack of B vitamins can easily lead to the phenomenon of thirst, in daily life, we suggest that the patient drink more water, eat more fresh vegetables, fruits, and maintain good oral hygiene, it will not be easy to appear the phenomenon of thirst.