A hard lump in the breast is a common type of breast disease, mainly divided into three cases: first, cystic hyperplasia of the breast, mainly related to the imbalance of the ratio of estrogen and progesterone, resulting in breast hyperplasia and degenerative abnormalities. The clinical manifestation is a hard lump in the breast with pain, and the size of the hard lump changes with the menstrual cycle. If the symptoms are mild, they can be treated by oral prolotherapy or local hot compresses, and the symptoms can be relieved, but if the lump continues to increase, there is a possibility of malignancy, and surgery is often required. Secondly, breast fibroids, mainly manifested as smooth and movable regular lumps in the breast, are considered to have malignant tendency, so once diagnosed, they should be removed by surgery. Thirdly, breast cancer, which usually occurs in middle-aged and elderly women, may not have obvious characteristic manifestations in the early stage, but in the advanced stage, the lump may invade the subcutaneous lymphatic network and make the breast appear orange peel sign.