Penis shortening may be caused by heredity, obesity, and insufficient androgen secretion, etc. It can be treated by medication and surgery. In case of short penis due to genetic factors, if it affects the normal function, penis lengthening surgery can be performed under the guidance of a doctor, and the patient needs to make a risk assessment to decide whether to implement the surgery or not. In the case of an invisible penis, the patient will have a tortoise head style penis. In this case, the patient can have the penis lengthened cosmetically by surgically removing the fat and the abnormally developed fleshy membrane. If the penis is short due to insufficient androgen secretion, patients need to undergo sex hormone six tests and take androgenic drugs such as testosterone propionate and methyltestosterone under the guidance of the doctor for treatment. If the penis is found to be short, the patient needs to consult a doctor in time for diagnosis and treatment by a professional doctor. The application of the above drugs must be under the guidance of a professional physician.