There are several cases of dry mouth: 1, breathing with the mouth, when swimming or nasal congestion will breathe through the mouth, gas and oral contact will dry the saliva in the mouth, resulting in dry mouth. 2, dry syndrome, dry mouth is a symptom of dry syndrome, the patient will always get up in the middle of the night because the mouth is too dry to drink some water. 3, saliva secretion is reduced, if the amount of saliva secretion is reduced a lot, there will be a dry mouth. If the symptoms of dry mouth last for a long time, you need to go to the hospital to do an examination to see which disease is caused. 4, diabetes, the amount of urine of diabetic patients will increase a lot, which will lead to a lot less water in the body, so it will also lead to dry mouth. 5, hyperthyroidism, hyperthyroidism will lead to accelerated heat dissipation in the body, the body’s water loss will accelerate, which will lead to The actual dry mouth, as well as the fear of heat, sweating, wet skin and other symptoms.