Itchy and painful breasts may be caused by breast development and expansion of breast ducts during puberty, which is a normal phenomenon and will gradually disappear with age. If a woman of childbearing age has itchy and painful breasts, it may be caused by disease factors, such as cystic hyperplasia, nipple cracking, acute mastitis, breast eczema, breast cancer, etc. 1, cystic hyperplasia of the breast: due to the imbalance of the ratio of estrogen and progesterone, the breast parenchyma hyperplasia and incomplete replenishment, thus causing cystic hyperplasia of the breast. It occurs mostly in women of childbearing age, with clinical manifestations of bead-like nodule formation in the breast, and may be accompanied by periodic breast swelling or tingling, occasionally accompanied by itchy and painful breast symptoms. In the pre-menstrual period is more obvious, after the menstrual period can subside, serious cases in the entire menstrual cycle may have breast itching, swelling, painful symptoms; 2, nipple crack: nipple area skin protection is not appropriate, can cause nipple cracking, serious cases can be painful symptoms at the crack, with the recovery of the disease, but also obvious itching symptoms; 3, acute mastitis: breast itching and pain during lactation, may suffer from acute mastitis, patients In the early stage of infection, there can be breast swelling, accompanied by slight tingling and itching discomfort, itching symptoms may not be obvious when the infection is aggravated, mostly severe pain in the breast; 4, breast eczema: breastfeeding women are prone to breast eczema, usually manifested as local papules, accompanied by itching and pain and other sensations; 5, breast cancer: some breast cancer patients, early breast itching and pain symptoms may also appear, should pay attention to observation, early active medical consultation.