Voiding original interruption is one of the common symptoms of bladder need, it is different from some prostate except hyperplasia patients with two methods of urination. The two methods of urination refers to because of various reasons (especially when there is a urinary tract obstruction so that the bladder encounters the contraction force of the urethral muscle can not be one time to exhaust the urine, and need to change the breath with the abdominal pressure method again to force to exhaust the urine of the situation. The interruption of urination refers to the process of urination, suddenly unable to urinate, often accompanied by severe pain, a little activity and change the position and then can again urinate. This is because when urinating, the stones in the bladder will change position with the flow of urine. If the stones happen to move to the neck of the bladder, they will suddenly block the urethral tract, causing interruption of urination. When the patient sleeps, sits down or does jumping exercises, the stone will move away from the bladder neck with the change in position, and then the patient will be able to continue urinating again. The bladder is like a sink we use to wash things at home, no debris in the water, the drainage is very smooth; if there are debris in the water, the debris in the drainage will be blocked with the water flow and the outlet of the sink, the water flow will be suddenly interrupted, and when we take away the debris, the water flow back to smooth. However, not all patients with bladder stones experience interruption of urination. For example, in patients with prostatic hyperplasia combined with bladder stones, because the hyperplasia of the prostate gland protrudes into the bladder so that the position of the urethral orifice is elevated, standing position stones can only be arranged along the periphery of the prostate gland and can not be with the flow of urine and block the urethral orifice, the symptom of interruption of urination will not occur. For such patients, the absence of symptoms of urinary interruption should not be mistaken for the absence of bladder stones.