Drinking water and holding it for a day without going to the toilet is harmful, and may cause the body to have kidney function damage, urinary system inflammation, bladder rupture and so on. 1. Kidney function damage: If you keep drinking water and hold it for a day without going to the toilet, holding urine for a long time may cause kidney metabolism to be affected, and in serious cases, it may lead to the patient to develop hydronephrosis, kidney metabolism abnormality, and kidney function damage. 2. urinary system inflammation: hold a day without going to the toilet may also lead to excessive storage of urine in the bladder, urine has been stored in the bladder, may cause bacterial growth, urinary system inflammation, such as cystitis, urethritis and other diseases. 3. Bladder rupture: Keeping drinking water and holding it for a day without going to the toilet will make the bladder under pressure, the capacity of the bladder is limited, if you keep holding your urine may lead to bladder rupture, affecting the patient’s health. Therefore, it is not recommended to hold urine for a long time, if there is a desire to urinate, it should be discharged in a timely manner so as not to affect the health of the body.