The role of the urethral sphincter is to control the expulsion and contraction of urine, and causes of urethral sphincter abnormalities may include conditions such as birth injury and diabetes. The urethral sphincter appears to diastole during urination, allowing the urine to pass out of the body, and is in a contracted state when not urinating, controlling the urine to remain in the bladder. If a woman has given birth several times, this may cause the muscles of the pelvic floor to relax or become damaged, both of which may lead to damage to the urethral sphincter and incontinence. If the patient has diabetes for a long time, it may damage the nerves that innervate the bladder and urethra, causing nerve disorders that can lead to abnormal functioning of the urethral sphincter, resulting in urinary incontinence or difficulty urinating. If the patient has urethral sphincter damage, it is necessary to pay attention to appropriate rest, avoid heavy physical labor, and consult a doctor when the symptoms worsen.