Middle-aged women with enlarged breasts are considered to be obese, breast hyperplasia, swelling in the breast and other causes. 1. Obesity: middle-aged women breasts become large, considering that the body may be excessive obesity caused by the body’s metabolic ability to weaken, long time intake of high-calorie food, may lead to weight gain caused by general obesity, if the fat accumulation in the breast area will also lead to the breast volume of the larger. 2. Mammary gland hyperplasia: middle-aged women’s breasts become bigger, may be caused by mammary gland hyperplasia, may be due to the body’s estrogen and progesterone level secretion abnormality and lead to mammary gland hyperplasia, which can be manifested as breasts become bigger. 3. Breast Cancer: Breast enlargement in middle-aged women may be related to breast cancer, which is usually manifested as painless enlargement of lumps in the breasts, and may appear as enlargement of the breasts. In addition, mastitis and breast trauma may also appear similar clinical manifestations, if middle-aged women breast enlargement, it is recommended to go to the hospital in a timely manner, under the guidance of the doctor, according to the condition of the targeted treatment, to avoid delaying the condition, resulting in other damage.