The main effect of diabetes on breast surgery is the need for glycemic control, which is generally required for elective medium- to large-sized surgeries at a level of 6.0 to 10.0 mmol/L. Patients undergoing surgery are in a state of stress, and diabetic patients with poor glycemic control are more likely to develop postoperative complications and have a higher perioperative mortality rate. For patients with diabetes mellitus, it is best to keep fasting glucose levels between 4.4 and 7.0 mmol/L. Patients with acute complications of diabetes, such as ketoacidosis, need to be treated with elective breast surgery. The specific effects of diabetes on breast surgery and the requirements of glycemic control need to be evaluated under the guidance of a doctor. It is recommended that diabetic patients who need breast surgery should go to a regular hospital, complete the relevant examinations, and standardize the treatment under the guidance of a doctor.