Breasts suddenly become smaller for a variety of reasons, specifically analyzed as follows: 1, after breastfeeding, breast milk emptying after breastfeeding, breasts will become smaller, under the stimulation of lactogen breasts will continue to produce milk, accompanied by lactation pain, is a normal phenomenon. 2, the end of lactation, the end of lactation, the end of breast breasts of breasts in the mammary ducts and fatty tissues will have a certain degree of degradation, will be the emergence of breasts become smaller, sagging, no longer erect! The performance of collagen can be supplemented, eat more fish, meat, eggs, milk. 3, the aging of the body performance, with age, the body functions will appear aging performance, the breast is no exception, will shrink, sagging, folds, you can eat more high-protein substances, and muscle exercise, delay aging. 4, breast cancer, cancer patients will have breast shrinkage, breast skin orange peel changes, nipple discharge performance, need immediate surgical removal of the breast. The breast cancer patients will have breast shrinkage, orange peel change of breast skin, nipple overflow, and need immediate surgery to remove the breast.