The presence of an erection in men without normal psychosexual stimulation is not a good sign and suggests pathological changes. For example, there is an abnormal erection of the penis or the recent use of certain medications that lead to an erection in a state of local vascular congestion. In other cases, men tend to have the habit of drinking more water before going to bed, and at midnight or early morning, when they are about to wake up in the morning, there is more urine in the bladder, triggering an erection of the penis. This situation is caused by normal physiological regulation, you should drink less water before going to bed or go to the bathroom in time to urinate when there is an erection, and the erection will return to its natural state after the bladder is emptied. If the penis is always erect after urination, this is an abnormal erection and the cause of the erection needs to be systematically checked. Generally, if the penis is abnormally erect, it is recommended that patients go to the hospital in a timely manner to prevent the local formation of blood clots due to prolonged blood depression and the transformation of abnormal diseases.