Drinking 1500 milliliters of water or no urine may or may not be dehydrated, but also may be caused by urinary tract blockage and so on. 1. Dehydration: If the patient does not have urine, there is a possibility of dehydration. If the patient’s body is in a serious dehydration situation, it will lose water, even after drinking 1500 milliliters of water or no urine. 2. No water shortage: If the patient is not dehydrated, but the function of producing urine is lost, such as hydronephrosis, renal failure, uremia patients, drink drink 1500 milliliters of water or no urine. 3. Urethral blockage: the patient has urine production, but due to urinary blockage, such as bilateral ureteral stones will be blocked ureter, urethral stenosis obstruction, the urine produced can not be discharged, but also manifested as no urine. This symptom alone is not enough to diagnose the disease, and there may be other factors causing it. It is recommended that the patient consult a doctor in a timely manner to clarify the cause of the disease and give targeted treatment.