A lump in the breast that is painful when pressed may be caused by mastocytosis in the first case. Generally, breast enlargement is a benign lesion that is associated with hormone levels in the body. When the estrogen level rises before menstruation, it can lead to hyperplastic changes in the mammary glands and alveoli, and the repeated hyperplastic changes can lead to periodic pain in the breast. If necessary, a breast ultrasound or mammogram can be performed at the hospital to determine the benignity or malignancy of the masses. If the diagnosis is clear that it is caused by breast enlargement, you can usually take oral Chinese medicine for symptomatic treatment, such as breast disease spirit or red gold anti-knot capsule. After a period of treatment, observe whether the lump has shrunk or disappeared. If the lump still exists, it can be removed for further pathological examination if necessary. The second condition may be caused by the accumulation of milk in the breast, which may lead to mastitis. It occurs mostly in breastfeeding women and is usually seen in first-time mothers. This is due to inexperience in breastfeeding, which leads to the accumulation of milk in the breast, and then to bacterial infection, which can lead to mastitis. Patients may experience pain in the breast, increased surface skin temperature, and possibly increased body temperature. Intravenous antibiotics, such as penicillin or cefothiamidine, and emptying of the milk are needed for a faster recovery.