Urinating a lot when you drink water is usually a normal physiological phenomenon, and the pathology may be caused by diabetes, cystitis and other diseases. 1. Normal physiological phenomenon: drinking water will make the body more water, the body in order to achieve the normal water balance in the body, will discharge excess water, so the urine becomes more, is a normal phenomenon. 2. Diabetes: Clinical symptoms of excessive drinking, urination, polyphagia and wasting as typical symptoms. Diabetic patients with elevated blood sugar which causes osmotic diuresis leading to increased urine. Diabetic patients should follow the doctor’s instructions to take medication on time and regularly, commonly used drugs are metformin, glibenclamide, etc., should be used under the guidance of a doctor, not self-medication. 3. Cystitis: when the bladder is stimulated by bacteria, stones, etc., so that the bladder inflammation, and the symptoms of urination, usually accompanied by frequent urination, urinary urgency, urinary pain symptoms. Cystitis can be treated with antibiotics to fight infection and drinking more water to flush the bladder.