The breast is normally soft, once you feel a local hard lump, you should go to the hospital in time for examination, consider it caused by mammary gland hyperplasia, mastitis, the breast is mainly made of breast tissue and fat accumulation, the whole breast feels soft to the touch and does not show pain or hard lump performance, the body hormone level changes before menstruation, women’s breast lobules interstitial edema, the glandular follicles of the breast produce Before menstruation, hormone levels change, the interstitial lobules of the breast become edematous, and the follicles of the breast become hyperplastic, which can lead to local pain. After menstruation, the hormone level retreats and the swelling disappears. When inflammation occurs in the breast area, it will lead to pain in the breast, and there will be hard lumps when touched by hand. Mastitis is caused by chapped and damaged nipples and bacterial invasion of the breast ducts causing inflammatory lumps in the breast area.