What problems can holding urine cause?

Urine retention can cause the following problems: 1. Damage to the kidneys causes renal insufficiency, and metabolic waste in the body cannot be discharged in time for a long time, which may damage the kidneys. 2. Cause hydronephrosis. Urine in the kidneys cannot be discharged in time when urine is held. For a long time, urine retention can cause hydronephrosis. 3. Easy to cause urinary stones. Patients with urine retention cannot discharge urine in time, and cannot play the role of flushing the urethra. It is easy to cause stones.