Small breasts may be related to excessive weight loss, genetic factors, decreased hormone levels, breastfeeding and other conditions. Depending on the cause, they can be enlarged through life conditioning, medication as well as surgical treatment. 1. Excessive weight loss: Excessive weight loss will lead to a decrease in fat in the breasts. It is necessary to change one’s dietary structure and eat more food containing fat, high protein and carbohydrates, so as to increase the fat in the body and improve the symptoms of small breasts. 2. Hereditary factors: if genetic factors lead to, the most direct way is to undergo surgical breast augmentation, the methods of breast augmentation include autologous fat breast augmentation and silicone breast augmentation. 3. Decrease in hormone level: If it is caused by anterior pituitary hypopituitarism, it can be treated by using hydrocortisone and LT4; if it is caused by postnatal pituitary necrosis, it can be treated by using thyroxine. 4. Breastfeeding: For small breasts caused by breastfeeding, it can be improved by increasing the fat content, or by exercising the chest muscles to improve the phenomenon of small breasts. If necessary, breast augmentation surgery can be performed. It is recommended that patients with small breasts go to the Breast Surgery Department in a timely manner, under the guidance of the doctor to carry out the appropriate conditioning treatment, not indiscriminate use of drugs.