One of the solutions after mastectomy is breast reconstruction using an abdominal flap. Women underwent this type of surgery demonstrated asymmetry in the vertical alignment of the trunk with greater asymmetry between the acronyms and greater trochanters, which can change trunk balance. In addition to rectus abdominis weakness that resulted in trunk flexion deficit. This reliable information gave the necessity for the prescription of physical therapy program to strengthen the abdominal muscles and correct the posture for better postural balance. The purpose of this study was to highlight physical therapy considerations with these surgeries. Materials and methods: this study was conducted on forty women who participated in the study were selected randomly from the research institute in Alexandria. They had undergone breast reconstruction surgery using transversus abdominis flap. Their ages ranged from 30-45 years old and their BMI didn`t exceed 29.9 kg/m². They were divided into two equal groups: A and B. Both were assigned to the same program for 30 minutes three times per week for eight weeks, and were treated by postural correction and diaphragmatic breathing exercises. Core stabilization exercises were added for group A. The study was conducted from July 2021 to January 2022. Balance was assessed using Berg scale and Modified Star Excursion test and functional capacity was assessed using six-minute walking test. Results: showed that there was a significant increase in balance in both groups (A and B) post-treatment using berg scale and Modified Star Excursion test. The improvement was in favor to group A. There was a significant increase in functional capacity in both groups (A and B) post-treatment using a six-minute walking test. The improvement was in favor to group A. Conclusion: It could be concluded that core stabilization exercises are valuable and effective method for improving stability and functional capacity.