Hard lumps in the sternum above the breast may be caused by breast fibroma, breast hyperplasia, skin lipoma, breast cancer, etc. Generally, it cannot be improved and cured simply by massaging and kneading, the specific analysis is as follows. 1. Breast fibroma: Breast fibroma is caused by imbalance of estrogen level in the body, with fibrous tissue as the main component, clinically manifested as painless lumps with smooth surface and no adhesion with the surrounding skin. Hot compresses and kneading may improve certain symptoms, but not cure. 2. Mammary hyperplasia: If the hard lumps appear during menstruation, accompanied by breast swelling and pain, generally due to the body estrogen disorders caused by breast hyperplasia, the breast can be touched by a single or multiple hard lumps, at this time, you need to adjust the level of estrogen in the body and improve the symptoms of daily life and work and rest, and can not be cured by rubbing. 3. Skin lipoma: Skin lipoma is formed by the accumulation of local skin fat, most of which are not accompanied by pain symptoms, hard and can be pushed. If the lipoma is not big, it can be followed and observed. If it is big, it needs surgery. However, physical means such as massage and squeezing cannot cure it. 4. Breast cancer: after the onset of breast cancer, the cancer appears as hard lumps inside the breast, with the development of lesions, the hard lumps continue to become bigger, and there may be breast pain, breast skin depression, nipple overflow, enlarged lymph nodes and so on, avoid rubbing, and ultrasonography and other imaging examinations, crude needle puncture and other pathology examinations should be perfected to make a clear diagnosis. The discovery of hard lumps in the breast may also be the cause of trauma, etc. It is recommended to go to the regular hospital in time for a clear diagnosis and early treatment.