Hard lumps found in the breast are common in the following cases: 1. Breast fibroadenoma. This kind of tumor occurs in young women, it is related to the abnormal increase of the sensitivity of fibroblasts to estrogen in the lobule, it occurs in the upper part of the outer breast, most of them are single, and there is no obvious self-conscious symptom. The lumps grow slowly, are tough and elastic to touch, with smooth surface and good mobility, and have little relationship with menstrual cycle. Surgical excision is the only effective way to treat fibroadenoma, and try to remove it before pregnancy.2. Cystic hyperplasia of the breast. Mostly seen in middle-aged women, characterized by breast swelling and pain, hard lumps are regular, and related to the menstrual cycle, if the lumps shrink or become soft after menstruation can continue to be observed, otherwise symptomatic treatment or surgical treatment is needed.3, plasma cell mastitis can also be found in localized masses, which can be accompanied by changes in the skin, and generally choose anti-inflammatory treatment, and surgical excision is needed if necessary. If you find a hard lump in the breast, you should go to the hospital in time.