In the clinical causes of penile erection are: first, physiological factors, if the body for a long time to stay up late, work too much mental stress caused by a decline in the level of sex hormones, causing men’s penile erection. Second, penis deformity, penis body abnormally curved short or by trauma, fracture caused by erectile failure. Third, due to frequent masturbation in the short term or excessive fatigue in the body after sex, resulting in the penis can not be erected again. Fourth, the male psychological factors caused, if for a long time in anxiety, low self-esteem will have an impact on normal sexual function, a series of symptoms such as short intercourse time, penile erection. Fifth, consider pathological factors caused by, for example, men suffering from kidney deficiency, impotence, sexual dysfunction and other diseases. Sixth, as men grow older, the function of various organs gradually decline, the penis will appear erectile symptoms, it is recommended to seek medical attention in a timely manner to avoid delaying treatment.