The explanation for holding urine dizziness is as follows: 1. When holding urine causes the volume of the bladder to expand, which stimulates the nerves that pull on the bladder, such as a certain increase in sympathetic excitability of the bladder. In addition, the excitability of the human brain cortex will also increase in order to consciously hold urine, and the tension and excitability of the sympathetic nerves in the brain will have a certain rise. In this case can lead to a temporary increase in brain function, causing an increase in excitability of the person, it can appear to hold urine dizziness this situation is a subjective sensory abnormalities. 2, holding urine dizziness may belong to a normal neurological reflex, because in the process of holding urine with the slow expansion of the bladder volume, will produce pressure on the surrounding nerve muscles. The compressed nerves or muscles are transmitted to the cerebral cortex through upstream conduction, causing the cerebral cortex to produce the feeling of dizziness.