The reasons for breast pain and itching are different for women of different ages: 1. Adolescent women, mostly between the ages of 9 and 13, are just before puberty, and the pain and itching can disappear on their own after the onset of menstruation. 2. Pre-menstrual women, the reason is that before the onset of menstruation, the level of estrogen in the body rises rapidly, causing the proliferation of breast tissue and edema in the breast tissue, resulting in unbearable breast swelling and pain, which can be relieved after the onset of menstruation. 3. 3, Pregnant women, some women have breast pain around 40 days of pregnancy, because the placenta secretes a lot of estrogen, progesterone and prolactin, which causes breast enlargement resulting in breast swelling and pain. 4, Postpartum women, breast swelling and pain often occurs 3-7 days after childbirth, mainly because the breast ducts are not open. 5, Post-abortion women, after abortion, the level of estrogen in the body drops suddenly, making the newly developed The breast stops growing and causes pain in the breast.