The breasts are big and soft, and sagging can occur in both women and men. It may be related to normal physiological phenomenon, breastfeeding and macromastia and other factors. 1, physiological phenomenon: it may be caused by skin laxity, their own too fat, chest fat caused by the natural sagging phenomenon. If a woman’s breasts are inherently large, this situation can also occur, which is a normal physiological phenomenon and does not require special treatment; 2. Breastfeeding: after breastfeeding, women can have a large, soft and sagging breasts, which is usually caused by the fact that the breasts are filled with milk during breastfeeding but emptied of milk after breastfeeding, which is a normal phenomenon and does not require special treatment; 3. Macroprolactinism: the excessive proliferation of the glands of the breasts and the connective tissue of the breasts, which usually occurs during puberty, and is often associated with the proliferation of the breasts. Macromastia: excessive proliferation of breast glands and fatty connective tissues, mostly occurring in adolescent girls or young women. It is mainly manifested as oppression of the chest, chronic mastitis, pain, erosion of the skin under the breast and other symptoms, which can lead to the patient’s chest is very large, soft and sagging symptoms. Mastectomy and mammoplasty are the main treatment modalities for this disease, which can adjust the shape and size of the breasts while preserving the lactation function of the breasts and the sensory function of the nipples. If the breasts are large, soft and sagging, and there is discomfort, it is recommended to go to the hospital and undergo a relevant examination in order to identify the specific cause. If it is caused by pathological factors, you need to actively cooperate with professional doctors for treatment to avoid aggravation of symptoms.