Erectile dysfunction etiology 1, psychological: normal sexual intercourse in addition to the requirements of men and women have a sound physiological function, (neurological, vascular, endocrine), but also requires no abnormal psychological. If the daily relationship between spouses is not coordinated, sexual stimulation is inappropriate or inadequate, there are bad sexual experiences in the past, there are inhibitory or distracting psychological factors that weaken sexual stimulation and sexual excitement response, it may destroy the normal response to sexual activity and lead to erectile dysfunction. 2, endocrine sex: hypogonadism, thyroid disorders, hyperprolactinemia, androgen synthesis reduction or incomplete action and other reasons can lead to erectile dysfunction. 3, neurological: erection is a neurovascular activity, erectile dysfunction can be caused by lesions of the brain, spinal cord, cavernous nerve, pubic nerve and nerve endings. 4, arterial: various disorders affecting the arteries of the penis, as long as it affects its blood perfusion, erectile dysfunction can occur. The most common arterial lesion is atherosclerosis, in addition to penile artery injury secondary to pelvic fracture and perineal closure injury can also cause ED. 5, venous: venous closure is the basic process of penile erection, and its normal function requires sufficient arterial blood flow into the cavernous body, normal diastole of cavernous smooth muscle and normal white membrane function. Any of the above functional abnormalities of the venous closure mechanism will fail and a large amount of blood will leak out of the penis from the unclosed veins. Chronic neuro-vascular diseases are prone to ED, with age-corrected prevalence of complete ED: risk factors for cardiovascular disease such as age, hyperlipidemia, and smoking are also risk factors for ED. After treatment of heart disease, hypertension and diabetes, corrected for age, the prevalence of complete ED was 39%, 15% and 28%, respectively. 6, medical: surgical trauma (such as prostatectomy, orchiectomy, etc.), certain drugs (such as antipsychotic drugs, antihypertensive drugs, etc.), radiation therapy, etc. can cause erectile dysfunction. 7, other causes: such as age factors, diabetes, chronic renal failure and other diseases can also lead to erectile dysfunction.