Stage I breast reconstruction is simpler compared to Stage II breast reconstruction. Stage I breast reconstruction is when the mastectomy and reconstruction are done together during the surgery, while Stage II reconstruction is a second surgery after a period of recovery. Breast reconstruction is categorized into one-stage and two-stage according to the timing of the surgery, also known as immediate and delayed reconstruction. One-stage breast reconstruction refers to the removal of a breast tumor along with breast reconstruction, which reduces hospitalization time and costs by removing and reconstructing the breast at the same time. Phase II breast reconstruction refers to breast reconstruction surgery performed after the removal of the breast tumor and a period of recovery after completion of adjuvant therapy. One-stage reconstruction can be better compared to deferred reconstruction. One-stage reconstruction is usually appropriate for mastectomy patients with skin preservation and can result in a better breast shape. Patients who undergo phase II reconstruction may have stiff, constricted skin due to scarring, which can have an impact on the shape of the breast. The timing of breast reconstruction usually needs to be decided in conjunction with the patient’s condition and subsequent treatment. Patients are advised to consult with their treating doctor and make a choice with the help of the doctor in conjunction with their condition.