Shoulder Exercise Training on Pain, Range of Motion, and Functional Limitations in Women Following Unilateral Mastectomy

Inclusion Criteria: * Participants must meet all of the following criteria: 1. Female adults between 30 and 65 years old. 2. History of unilateral breast cancer managed with either: * Modified radical mastectomy, or * Breast-conserving surgery with axillary clearance. 3. Postoperative interval between 4 and 12 weeks before enrollment. 4. Objective evidence of impaired shoulder mobility or function including: * Reduction of ROM ≥ 15% compared to the contralateral side, * VAS pain ≥ 3/10 during shoulder movement, or * DASH functional score \> 25. 5. Ability to ambulate independently and follow therapist instructions. 6. Willingness to commit to the full rehabilitation protocol for 8 weeks. Exclusion Criteria: * Participants will be excluded if they have: * Previously diagnosed shoulder disorders (adhesive capsulitis, rotator cuff tear, fracture/dislocation). * Active or untreated lymphedema Grade II-III. * Ongoing chemotherapy-induced neuropathy causing shoulder dysfunction. * History of neurological or rheumatological disorders affecting the upper limb. * Metastatic disease or local recurrence. * Recent infection, seroma, or unhealed surgical wounds. * Participation in another physical therapy or exercise program in the past 4 weeks. * Cognitive impairment or psychiatric conditions interfering with adherence.