Postmenopausal breasts may be caused by breast enlargement, mastitis or tumors inside the breast. 1. Mammal hyperplasia: Mammal hyperplasia is likely to lead to fuller breasts, when the human body appears mammary gland hyperplasia breasts are easily stimulated by estrogen, under the stimulation of elevated hormone levels, human breast tissue is prone to cell proliferation, which may lead to the appearance of breast congestion, edema, and in severe cases, may lead to the breasts showing a diffuse increase in size, so that the breasts look more straight and full. 2 Mastitis: Generally speaking, after menopause, women’s breast ducts will expand, which is very easy to cause mastitis. With the expansion of the breast ducts, the human body secretions gathered to stimulate the duct wall, at this time do not pay attention to personal hygiene will easily cause the occurrence of mastitis, so that the breasts are swollen, look more plump. 3. Tumors in the breast: Tumors in the breast can also lead to breast enlargement, which is related to the imbalance of human estrogen level. When there is a tumor inside the breast, the tumor may gradually increase in size, making the breasts look fuller. In addition, fuller breasts after menopause may also be caused by breast cysts, breast cancer, etc. It is recommended to go to a regular hospital for examination.