Sagging breasts may be caused by breastfeeding, weight loss, age factor, gigantomastia, and so on. 1. Breastfeeding: Due to the decrease in hormone level after stopping breastfeeding, the alveoli, glands and fatty tissues of the breasts will shrink, while the corresponding skin and supporting tissues are more, thus leading to breast sagging. 2. Weight loss: because of losing weight too fast, the breast fat tissue decreases, which leads to breast sagging. 3. Age factor: With gradual increase in age, skin elasticity and body tissues age. When the fat and elastic fibers in the breasts decrease, it will also show up as sagging breasts. 4. Macromastia: In general, patients with macromastia usually experience sagging due to overdeveloped and enlarged breasts, excess glandular and fatty tissue, large size and weight. Others may be caused by diseases, such as breast hyperplasia, mastitis, etc. It is best to treat the symptoms under doctor’s guidance after examination and pay attention to daily care.