Breast hardening is seen in the pre-menstrual period, due to changes in hormone levels leading to edema of the soft tissues of the breast, so it will be manifested as breast swelling and pain, and on examination, it will be manifested as a feeling of hardness and toughness on palpation of the breast. There are also some patients will be combined with breast hyperplasia lumps, this symptom will be more obvious, but do not worry too much, need to regular color ultrasound examination of the breast. Normally, you should pay attention to the regularity of life, and appropriate physical exercise to enhance physical fitness, which is also conducive to the recovery of the condition. If there is no reason for the hardening of the breasts, it is also necessary to further combine with the relevant examination to carefully check the body. Some are caused by pathological conditions, commonly occurring in the breast tumor, malignant tumors are common, including breast sarcoma, which is derived from mesenchymal tissue, mesodermal tissue, as well as breast cancer, which is derived from the epithelial tissue of the breast follicles.