Drink a lot of water or thirsty, the reasons are as follows: 1, diabetes, when the body’s blood sugar level is too high, the body will exert more pressure on the kidneys, resulting in the kidneys need to generate more urine to remove excess glucose from the body, which leads to a reduction in body water, causing thirst. If there is excessive thirst, accompanied by increased urination, as well as unexplained weight loss, fatigue and irritability, special attention needs to be paid to whether you are suffering from diabetes; 2. Dry mouth syndrome, frequent dry mouth is not a minor problem, this may be dry mouth syndrome. Dry mouth, also known as oral dryness, is an abnormal dryness in the oral mucosa, formed by a decrease in the amount of saliva or a change in the composition of saliva; 3, hypotension, low blood pressure will cause low adrenal gland function, which will also cause hypotension in the long run, hypotension can cause dizziness, depression, anxiety and a sense of extreme thirst. Thirst is the body’s way of adding more water to the blood in an attempt to raise blood pressure, so patients with low blood pressure are also prone to thirst; 4, anemia, the loss of red blood cells in the body of anemic patients is greater than the rate of production, so it will cause a sense of thirst, the need to replenish the loss of body fluids; 5, uremia, uremia is due to the imbalance of hormones in the body affects water absorption, uremia patients can not control urination, resulting in a large amount of water discharge from the body . Urogenesis also causes dehydration phenomenon and overactive bladder, at this time to replenish the body water leads to a sense of thirst.