Bladder can insist on how long to hold the urine, and individual physical and mental state and many other factors, and there is no absolute uniform time standard, the general situation of holding the urine time in half an hour or so. When the human body reaches the initial sensory capacity, that is, the patient initially feel the desire to urinate in the bladder, then should go to the urine in time, reduce bladder pressure, to avoid bladder damage. At this time, if there is no urination, in general, normal people are affected by psychological and mental factors, bladder capacity under normal circumstances, about can hold about half an hour, if it is the elderly or the existence of their own urinary system diseases, the holding time is shorter. Holding urine for too long, may occur increased pressure within the bladder, resulting in urine reflux into the ureter, or even reflux to the kidneys, damage to the kidneys, may also lead to urinary tract infections, etc., so it is recommended to urinate in a timely manner, should not be held for a long time.