Adolescent gigantomastia refers to the development of large breasts (more than 800 grams larger than normal on each side) before the age of 18. Adolescent gigantomastia can be divided into three categories: 1. Teenage gigantomastia: breasts begin to increase rapidly before the age of 13 and still show no signs of stabilization or cessation of development by the age of 18; 2. Adolescent gigantomastia: is breast development that begins at puberty and stabilizes or stops by the age of 18; 3. Obese gigantomastia: body obesity with a body mass index of more than 30. Clinically common are categories 2 or 3, and adolescent gigantomastia is mostly accompanied by obesity, with obesity macromastia is difficult to distinguish. The treatment of adolescent breast enlargement is mainly surgical. There are three common misconceptions about adolescent breast reduction: 1. Breast reduction surgery is only for cosmetic purposes. In fact, it is not, giant breasts will bring great physical and mental pain to the affected children, mainly manifested as: shoulder and back pain, bra strap indentation, skin changes below the breast (thinning, eczema), inconvenient movement, increased psychological burden. 2. Simple weight loss can reduce the size of large breasts. The breast is often overdeveloped and obese, simple weight loss can not achieve the purpose of treatment of large breasts. After the reduction of large breasts is conducive to exercise, to enhance the weight loss effect. 3, giant breast reduction surgery can only be implemented after the age of 18 or after breastfeeding. Teenage type giant breasts will keep growing, affecting normal life and learning, as long as parents agree, understand and accept the possible complications of surgery, can be operated at any time, but need to account for the possible recurrence of the need for re-operation. The timing of surgery for adolescent or obese breast enlargement is chosen when the breast development is stable for more than 6 months. Foreign literature reports that the average age of adolescent breast reduction is 13-14 years. To conclude, adolescent breast enlargement affects the physical and mental health of the child, and treatment is mainly surgical, with safe surgery and reliable results, and adolescent breast enlargement with a clear diagnosis is easily treated by surgery as early as possible.