Thirst can be a precursor to diseases such as diabetes mellitus, dry syndrome, and uremia, although it can also be related to environmental heat and other causes. 1. Diabetes mellitus: Insulin utilization disorder and/or absolute or relative insulin secretion insufficiency, resulting in the patient’s body blood glucose level increases, blood osmotic pressure changes, there will be thirst, drinking and other symptoms. 2. Dry mouth syndrome: the onset of the disease is more insidious, the specific cause is unknown, generally believed to be related to the family aggregation of genetic, immune dysfunction and other reasons. People with dry mouth syndrome often have symptoms such as thirst and frequent drinking before the onset of the disease. 3. Uremia: this disease is related to the reduced sensitivity of the kidneys to argininopressin, argininopressin deficiency of varying degrees, etc. In the early stage of the disease, the patient will have a large amount of urination, mental irritability, extreme thirst, frequent drinking of water and other symptoms. 4. Hot environment: When the environment is hot, the loss of water in the body is more, which will also trigger thirst symptoms. This condition is not related to the disease. When there is an abnormally frequent thirst, it is necessary to go to the hospital in time to find the cause, and cooperate with the doctor to carry out targeted treatment.