Hearing the sound of water and wanting to urinate is a conditioned reflex, a normal reflex of the human body. Conditioned emission refers to the original stimulus that can not cause a certain response, through a learning process, that is, this stimulus and another stimulus that can cause a response at the same time, so that they establish a link with each other, so that the link between the conditioned stimulus and the conditioned response is called the conditioned reflex. Because every time a person urinates there is the sound of water, over time, the conditioned reflex of wanting to urinate when hearing the sound of water is formed. In addition, there are some disorders that can cause this, such as overactive bladder syndrome. There are also the muscles of the bladder, that is, the perineal muscle activity is too large, not under the complete control of the brain, a small amount of urine will produce its own contraction of the perineal muscle, resulting in a series of manifestations such as urinary frequency, urinary urgency, urge incontinence, and so on, and this situation needs to go to the hospital for further examination and treatment. In addition to psychosomatic factors caused by conditioned reflexes. May have had a previous urinary system related diseases, even after recovery, there is still a related mental psychological stimuli, and thus the sound of water caused reflexive urination. If you feel that you have abnormal urination, it is recommended that you go to a regular hospital in time for treatment.