Edema in the arm after breast cancer surgery is mainly due to lymphatic reflux obstruction, which can be treated by elastic bandage, upper limb exercise and other methods. Breast cancer often metastasizes through lymphatic circulation, so some of the lymph nodes, such as those located in the armpit and other parts of the body, will be cleared during the surgical treatment of breast cancer, as well as biopsy after surgery. The lymphatic fluid in the upper limbs mainly returns through the axillary lymph nodes, so it may affect the lymphatic return of the upper limbs and cause the phenomenon of postoperative arm edema. After the appearance of upper extremity swelling can be used, for example, elastic bandage or pneumatic compression therapy, but also under the guidance of the doctor or nurse, the upper extremity exercise, can reduce edema, if the lymphatic vessel damage is serious need lymphatic vessel microsurgery reconstruction The edema of the arm after breast cancer surgery should seek medical treatment in time and follow the doctor’s instructions.