Hello! Impotence caused by many reasons, such as: mental factors; anything that might lead to penile cavernosal artery blood flow reduction diseases; surgery, trauma related penile blood vessels and nerve injury, resulting in erectile dysfunction; endocrine disorders, chronic diseases and long-term use of certain drugs ; prostatitis, prostatic hyperplasia recurrent long treatment; may also be a special kind of disease - caused by Peyronie's disease, the disease is characterized by nodules on the penis or a cord-like induration. Recommend you to my hospital treatment of sexual dysfunction subjects is available through advanced diagnostic techniques to confirm the diagnosis, targeted treatment is completely curable.