The most common condition leading to breast reconstruction is breast cancer. A mastectomy may be needed to treat or prevent cancer. However, women may have their breasts removed due to other conditions. Even breast-preserving procedures may result in one breast being smaller than the other. Psychological factors account for some of the most important conditions related to the decision to have breast reconstruction. Surgery may restore not only an attractive physical appearance, but a woman’s self-confidence, personal image and sense of wellbeing.