Male urinary stones tend to get stuck in the relatively narrow parts of the whole urinary system, which are the three strictures of the ureter, the three strictures of the urethra, and the two bends. 1. Three strictures of the ureter: the renal pelvic ureteral junction, which is the first stricture of the urinary system, and the part of the ureter that crosses the common iliac artery, which is the second stricture of the ureter. And the section of the ureter into the bladder, clinically known as the intermural segment of the ureter, is the most narrow part of the entire urinary system, prone to male urinary tract stones easy to jam. 2. Three narrowings of the urethra: There are three narrowings in the urethra, including the neck of the bladder, the tip of the prostate, and the external urethral opening. After passing through the bladder, it will be easy to reappear male urinary stones easy to jam. 3. Two bends: the two bends of the urethra, which can be divided into the anterior pubic curve and the inferior pubic curve, are also prone to male urinary tract stones prone to jamming. Men who have urinary tract stones are prone to jamming, should immediately go to the hospital, clear the cause of the disease, and then follow the doctor’s instructions for treatment, so as not to delay the condition.