Failure to have an erection belongs to erectile dysfunction, which is one of the most common sexual dysfunctions in men, and can be caused by a variety of reasons, such as psychosomatic factors and organic factors. 1. Psychological factors: such as daily work or economic pressure, bad sexual experience, husband and wife relationship disharmony, lack of sexual knowledge may cause the penis can not be erected. Usually, keeping a positive and optimistic mindset and improving lifestyle can improve the symptoms. 2. Organic factors: penile anatomical and structural abnormalities such as penile trauma, urethral cleft or hypospadias, etc., pituitary tumors, testicular hypoplasia and other diseases resulting in low androgen levels, vascular lesions resulting in insufficient blood supply to the penis, and other organic diseases may cause failure of penile erection. We need to find out the cause of the disease, and actively carry out the treatment of the original disease. When the penis can not be erected, you need to go to the hospital to find out the cause of the disease, under the guidance of the physician reasonable treatment, so as not to delay the condition.