Breast cancer is one of the most common cancers among women worldwide, with surgery being a primary treatment. However, surgical tumor resection combined with lymph node dissection often leads to upper extremity lymphedema as a complication. This study aims to evaluate the effectiveness of preoperative rehabilitation exercise on upper limb function, lymphedema severity, quality of life, and post-discharge care needs in breast cancer patients undergoing surgery.

Participants will be assigned to either an experimental group receiving individualized preoperative rehabilitation exercise instruction or a control group receiving standard clinical nursing education. Outcomes will be measured across seven time points from pre-operation up to one year post-surgery.