Symptoms of plasma cell mastitis mainly include breast lumps, nipple discharge, swollen and painful lymph nodes in the axilla of the same side, etc. Its pathogenesis is characterized by a slow progression of the disease and recurrent symptoms. 1. Breast lump is the first symptom of most patients, patients can touch the lump in the deep part of the areola, in the early stage of the disease, there are swelling, pain, redness of the skin in addition to the lump, but the systemic reaction is light, fever is not obvious. With the progression of the disease, the breast lump can be reduced to a hard knot, hard knot border is unclear, the number of indeterminate, the size of the initial stage may only be about 1cm, months or years later, the volume can be increased to about 3-5cm, the texture is more and more solid, and often with the local skin of the mammary gland, resulting in the mammary gland appearing cellulite changes. The seriousness of the disease can make the breast appear deformation, resulting in nipple retraction or nipple reverse change. 2. Nipple discharge usually occurs after the discovery of breast lumps or at the same time, and some patients first appear to discharge. Most of the nipple discharge is yellowish slurry or yellowish turbid mucus, and blood discharge is rare. Repeated overflow leads to a small number of patients with small abscesses around the areola and periphery, which are not easy to heal and repeatedly damage the breast to form fistulas and sinus tracts. 3. Enlargement of lymph nodes in the axilla of the same side, the lymph nodes are soft and the pain is not obvious when pressed. In addition, some patients also have breast redness and swelling, if the pus breaks down will also form a sinus tract, it is recommended that the patient according to their own symptoms in time to the breast surgery for examination and symptoms, so as not to delay the condition.