If you have a hard lump when you press on your breast, you should come to the hospital in time for examination because it may be a benign lump or a malignant lump. If it is benign, it can be followed up, but if it is malignant, if it is not treated in time, there is a possibility of tumor metastasis and so on. Ultrasound or mammography examination of the breast can be performed first to determine the benignity and malignancy of the mass, taking into account the echogenicity, texture, boundary, and the presence of calcification of the mass. If a benign mass is diagnosed, surgery may be unnecessary for the time being if the mass is small, or it may be surgically removed if the mass is large. If the mass is suspected to be malignant, i.e., breast cancer, a modified radical breast cancer surgery is usually required, in which the breast is removed and the axillary lymph nodes are cleared.