The length of an erect penis of an adult male in China ranges from 8cm to 16cm, and the width is from 2cm to 4cm, so an erect penis of 16cm in length and 4cm in thickness is not considered small. If a man feels that his penis is small, first of all, he should go to the hospital in time to consult the doctor, listen to the doctor’s professional opinion, so that the doctor can judge whether the penis is really small. Some men subjectively feel that their penis is smaller than others, but in reality the size of the penis belongs to the normal range of development. In this case, if pathological problems are ruled out through the doctor’s examination, there is no need to worry too much. For truly pathologic small penis, treatment is needed. For small penises caused by congenital hypogonadism, sex hormone supplementation can be used to promote the development of male secondary sexual characteristics; for small penises caused by hypospadias, surgical correction of the hypospadias deformity may be needed in childhood to avoid affecting the subsequent growth and development of the penis. Patients with a small penis should go to a regular hospital as soon as possible, under the guidance of the doctor for targeted treatment, so as not to delay the condition.