Clinically, if the human body faints after urination, it may be a pheochromocytoma of the bladder, and CT examination of the bladder can reveal a space-occupying lesion. Pheochromocytoma of the bladder in the human body during urination, due to the bladder contraction pressure suddenly reduced, will stimulate the internal tumor release catecholamines such as hormones, which leads to the human body blood pressure fluctuations, resulting in fainting phenomenon. Therefore, patients should go to the hospital in time for examination, and clarify whether there are elevated catecholamine levels in the blood, and carry out targeted examinations, including imaging, such as cystoscopy can detect specific lesions. Once the above diseases appear, patients need timely surgical treatment, if the treatment is not timely, long time repeated blood pressure fluctuation, will cause more serious complications, and even cause the human body to appear cerebral stagnation, cerebral hemorrhage may occur.