Water is not allowed to be drunk on dialysis, mainly because drinking water may lead to an increase in volume load, which can easily aggravate edema or cause heart failure. If the overall condition before dialysis is good, you can drink small amount of water. Dialysis includes hemodialysis and peritoneal dialysis, which can help the body excrete excess water and toxins. Patients who need dialysis usually have serious kidney dysfunction, and most of them are uremic patients. Most of these patients are in a state of reduced or no urine output, and water cannot be excreted and accumulates in the body. If you drink water in this situation, the water in the body can not be excreted, which may lead to an increase in volume load, chest tightness and generalized edema and other phenomena, may also induce acute heart failure, and in severe cases, sudden death may occur. For dialysis patients, water intake does not only include drinking water, but also other liquids, such as tea, beverages, and water in the food they eat. If water intake is not controlled, it may exacerbate the primary disease and lead to a decrease in the effectiveness of dialysis. However, not all dialysis patients should not drink water at all. If the edema is not particularly obvious before dialysis, and there is no heart failure or other problems, you can drink a small amount of water. If dialysis patients are not feeling well, it is recommended that they go to regular hospitals in time and receive standardized treatment under the guidance of doctors.