Urethral sphincter spasm may be caused by urinary tract infections, stones, or abnormal neuromodulation, which will affect normal urination, as well as abdominal distension and pain and other symptoms. 1. Urinary system infection: common diseases such as cystitis, urethritis, prostatitis and other diseases can cause local inflammatory reaction, stimulation of the mucous membrane may lead to spasm of the urethral sphincter. 2. stones: common kidney stones, ureteral stones, bladder stones, there may be a change in location, resulting in urethral obstruction, causing local spasm pain, resulting in spasm of the urethral sphincter. 3. Abnormal regulation of the nervous system: for example, trauma, lumbar spine lesions, cerebrovascular disease, may affect the nerve function, thus leading to urethral sphincter spasm. Urethral sphincter spasm, should go to the hospital in time to check the cause of the disease, and actively corresponding treatment.