The condition of holding urine may lead to bleeding in urination, which is often seen in the condition of excessive urine holding, such as holding urine in the bladder greater than 300mL, which can cause there to be an increase in bladder mucosal tension, which may cause bleeding. The process of holding urine and then urinating quickly afterwards may also cause bleeding. Because the pressure in the bladder gradually decreases after urination, this can cause small arteries to dilate or small veins to dilate, which may cause bleeding. Conditions seen in diseases that manifest as blood in urine after excessive urine holding, such as urethral strictures, urethral stones, and male prostatic hyperplasia, can lead to having difficulty urinating. A large amount of urine is held in the bladder, and this results in the occurrence of hematuria. Also in the state of holding urine, if the patient needs to catheterize quickly, he or she needs to release urine intermittently to lower the pressure inside the bladder. Avoid causing there to be rapid release of urine, which can cause there to be too much pressure drop, and this can cause there to be bleeding after release of urine. However, holding urine is not the only factor that causes hematuria, but may also be related to the presence of infection, stones, tumors and other factors in the urinary tract, which need to be further examined in the hospital.