There are several possibilities for lumps in the breast and pain when pressed: firstly, mastitis, which often occurs in breastfeeding women because of the accumulation of milk caused by poor milk discharge and mastitis, manifested as breast pain, lumps, and pain aggravated by pressure. If it is serious, the skin will be red and swollen, and the body temperature will rise. Second, cystic hyperplasia of the breast, is a common and frequent disease, can occur at any age after the development of female mammary glands, the pain has a certain degree of regularity in relation to menstruation, the pain is aggravated before menstruation, and the pain is alleviated after menstruation. Third, breast fibroadenoma, the clinical manifestation is that there is a lump in the breast, the surface is relatively smooth, the mobility is relatively good, and occasionally there will be pain when the lump is pressed. Fourth, breast tumor, such as breast cancer, most of them are painless lumps with poor mobility, but some of them will have pain when pressed. In the above cases, breast ultrasound or molybdenum target examination can be done, and most of them can be clarified.