The principle of the sound of running water to help urination is to use the conditioned reflex slow, prompting the body to produce the desire to urinate and urinate. Clinically, some people who have difficulty urinating can first listen to the sound of running water to promote urination. The main use of conditioned reflexes to make the cerebral cortex downward impulses, transmitted to the sacral medulla primary urinary center, causing pelvic nerve efferent fiber excitation, so that the bladder wall contraction of the urethral muscle and internal and external sphincter diastole, the body will be stored in the urine discharge. The human body hears the sound of water will generally have a sense of urination, usually belongs to a normal reflex, such as urinary discomfort, it is recommended that urinary abnormalities in a timely manner to medical examination, in order to clarify the specifics of the case after the treatment prescribed by the doctor, do not use their own indiscriminate use of medicines or prescriptions.