You cannot have a mastectomy for oversized breasts, but you can have a reduction mammoplasty. Oversized breasts are also called macromastia, which causes extreme sagging of the breasts and interferes with normal life. Mastectomy is used to treat breast malignant tumors in most cases. Clinically, it can also be used to predict the risk of breast cancer based on genetic test results, and preventive mastectomy can be done for those with a high risk of developing breast cancer, while macromastia is not an indication for mastectomy. Macromastia can be treated by breast reduction surgery, which requires accurate preoperative design, assessment of the amount of glands and skin to be removed, as well as the position of the nipple areola after the surgery, and through plastic surgery techniques to reduce the size of the breasts after sewing, while at the same time lifting the breasts to improve the appearance of the breasts. It is recommended to go to a hospital with plastic surgery qualification for consultation and treatment for oversized breasts.