The phenomenon of involuntary overflow of urine is caused by the inability to artificially control the will to urinate. There are several possible causes: first, urge incontinence, which often occurs when symptoms of infection in the urinary tract appear, that is, urge incontinence. The patient’s bladder sensitivity is significantly increased, when the bladder is filled with urine, you can immediately want to go to urinate, sometimes on the way to the bathroom can occur can not control urination and urinary incontinence, accompanied by urinary urgency, urinary frequency, painful urination and other symptoms. It is recommended that urine be collected for routine or culture tests to rule out the presence of infection. Sometimes irritating factors in the bladder can also cause urge incontinence, such as bladder stones, patients often want to go to urinate, and sometimes the phenomenon of involuntary overflow of uncontrollable urine. Second, stress urinary incontinence, common in women. With age, the pelvic floor muscle relaxation can appear the lower shift of the urethra and bladder, the patient at rest to urinate normally. But in the case of increased abdominal pressure, such as coughing or jumping, running, etc., involuntary urinary incontinence can occur, usually without any urinary irritation symptoms, no urinary frequency, urinary urgency, no hematuria and other symptoms. Thirdly, true urinary incontinence is common after surgery on the urethra or bladder neck, where the inability to clamp urine occurs. This condition is mostly related to damage to the sphincter muscle caused by surgery, which leads to incomplete closure. This type of incontinence is usually at rest or during exercise in a state of incontinence, with no significant improvement or change.