In the early stage of infection, there is only breast swelling and pain, and when the infection extends further, a fluctuating breast lump may appear, often combined with systemic symptoms of infection.3. Breast Cancer, there is no characteristic clinical manifestation in the early stage of the disease, when the disease progresses to the advanced stage, hard, poorly movable and irregular lump can be touched in the breast. Therefore, when you find hardening of the breast, you should go to the breast surgery department of regular hospitals for breast ultrasound examination to clarify the nature of the lumps and take appropriate treatment under the guidance of specialists to avoid delaying your condition.