It is always felt that the urine can not be passed cleanly, it is likely to be caused by the existence of mechanical obstruction in the lower urinary tract or power obstruction. The phenomenon of not being able to urinate cleanly is mostly due to the existence of problems in the lower urinary tract, that is, the patient’s urethra and bladder obstruction, which may be mechanical obstruction, such as prostate cancer, prostate hyperplasia, bladder tumors, bladder stones, urethral tumors, urethral stones and urethral stenosis and other diseases that are prone to cause such a symptom. It may also be caused by dynamic obstruction, due to the existence of certain damage to the central and peripheral nerves controlling urination, resulting in bladder forceps muscle weakness, or the urethral sphincter muscle spasm caused by the symptoms. Common causes include peripheral neuritis, diabetes, multiple sclerosis, or a history of pelvic surgery, resulting in damage to the voiding nerve. The exact cause needs to go to the regular hospital for relevant examination to get the accurate conclusion, and then give the corresponding treatment.