After mastectomy, it is necessary to rest for 3 to 6 weeks, the exact time will vary depending on the surgical method, the degree of illness, and the individual’s physical condition. Mastectomy mainly includes partial mastectomy, total mastectomy and radical mastectomy. In case of simple partial mastectomy, it usually takes 2 to 3 weeks of rest to recover, but attention should also be paid to the rehabilitation exercise of the affected arm, so as to avoid postoperative mobility disorders affecting the recovery time. If early breast cancer after mastectomy, usually need to rest for 4 to 6 weeks to recover; if breast cancer stage is later, after mastectomy, also need to carry out chemotherapy, radiotherapy and other adjuvant treatment, the recovery time will be prolonged, usually more than 6 weeks. After mastectomy, one should pay attention to diet and do rehabilitation exercises under the guidance of doctor to promote recovery.