A man’s penis can not be erected is mainly considered to be erectile dysfunction, which may be related to psycho-psychological factors, organic lesions, drug effects and other factors. 1. Spiritual psychological factors: due to bad sexual experience, excessive pressure, mental stress, depression, as well as husband and wife relationship disharmony, etc., may cause erectile dysfunction, the penis can not be erected. 2. Organic lesions: If there are lesions in the nerves, blood vessels or reproductive organs related to erection, such as hypogonadism, diabetes, arteriosclerosis, hypertension, or penile trauma, peripheral neuropathy and so on. It affects the nerves related to erection, which leads to the inability of penile erection. 3. Drug influence: due to excessive use of sedative hypnotic drugs, anti-tumor drugs, etc., may lead to the phenomenon of patients can not get an erection. When the symptoms of the penis can not be erected, you should consult a doctor for examination, clarify the cause of the disease, and follow the doctor’s instructions for treatment.