Erection is not very hard, clinically called erectile dysfunction, leading to the following causes: First, psychological factors, possibly due to emotional problems between the couple or aesthetic fatigue. Second, endocrine function is affected, most commonly by increased blood sugar, imbalance in thyroid hormone levels and imbalance in sex hormone levels, judged by age as well as physical quality. Third, a more common cause is hypertension patients taking antihypertensive drugs, especially calcium antagonists, which can have an effect on erectile function. Fourth, consider the abnormalities of penile vascular function, which may be caused by impaired penile vascular endothelial function. Fifth, the nerve loss, combined with spinal trauma patients will have this symptom. Sixth, consider a patient with prostate enlargement, if the prostate electrosurgery is performed, it may affect the nerves of the gonads, and this will combine with erectile dysfunction.