The possible reasons for not going to the toilet after drinking a lot of water are as follows: 1. The heat causes too much water to evaporate from the body surface or the body itself has vomiting and diarrhea, resulting in too much water loss in the body. Drink in the water is not enough to replenish the lost water, so temporarily in the state of no urine. It is necessary to continue to replenish water in order to achieve a state of fluid balance and urination, which is a normal regulation and not a disease condition. 2. abnormal kidney function, resulting in the accumulation of water in the body, which cannot be excreted, and a dramatic reduction or disappearance of urine, which is common in acute renal failure, when there can be a large accumulation of water, patients appear edema of the face and limbs, and serious Patients may even have abdominal and pleural effusions, which require further renal function tests to confirm the diagnosis. 3. The presence of urethral strictures, urethral stones, tumors, and other obstructions cause water to accumulate in the bladder and cannot be discharged. In this case, the patient usually has an obvious feeling of holding urine, but has difficulty in urination, and further catheterization is needed.