Normal people drink too much water to cause weight gain is only temporary, through the urine can be excess water out of the body. If you suffer from heart failure, chronic kidney disease and other diseases, drinking too much water leads to weight gain, you need to apply diuretics for treatment and dialysis if necessary. Within a certain range of water intake, the human body can regulate the amount of water in the body through the kidneys, so the weight gain caused by drinking too much water is only temporary, and the excess water can be discharged from the body through urination, so that the weight returns to normal. If the patient has heart failure, chronic renal insufficiency and other diseases resulting in decreased renal drainage capacity, it will cause water retention, leading to edema in mild cases, and in severe cases, it can cause acute heart failure. At this time, the patient will have symptoms such as chest tightness, shortness of breath, aggravated by activities, and even inability to lie down, etc. It is recommended to seek immediate medical attention.