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Responsible for 2.4 to 8.4 percent of all cases of fainting in adults, it most commonly occurs in males. The events often occur at night or after awaking (this means that it occurs while standing immediately after being recumbent for some time).
When one strains to increase the flow of urine it stimulates the vagus nerve (usually more pronounced in elderly men with large prostates). The vagus nerve stimulus causes slowing down of the heart (bradycardia) and a drop in blood pressure. The heart cannot perform as a pump effectively because insufficient blood comes to it. It is classically associated with a tumor known as a [[Paraprostatic pheochromocytoma]] within the urinary bladder.
There is no specific treatment for micturition syncope. General advice to men who have a micturition syncope includes: