Breast hardness is a common phenomenon, there are two main possibilities: first, cystic hyperplasia of the breast, for estrogen and progesterone ratio imbalance, resulting in breast hyperplasia and incomplete replenishment, the clinical manifestations of most of the breast swelling and discomfort with the formation of breast hard lumps. The pain and the size of the lumps are related to the menstrual cycle, and the pain increases and hardens before menstruation, and is relieved after menstruation. If the symptoms are mild, it can be relieved by oral prolotherapy or local physiotherapy, but once the medication is ineffective and the lump continues to grow, surgery is often required. Secondly, breast cancer is a malignant tumor of the breast, which has no characteristic clinical manifestation in the early stage, but when the disease progresses to the advanced stage, a hard lump can be palpated in the breast, and when the tumor invades the subcutaneous lymphatic network, the breast can be changed to orange peel sign, and when it invades Cooper’s ligament, the breast can be changed to dimple sign. Once you suspect breast cancer, you should go to a regular hospital for breast surgery to get a clear diagnosis.