1. What kinds of breast nodules are there? Mammary gland hyperplasia: The incidence of mammary gland hyperplasia is very high, about 70% of women have varying degrees of mammary gland hyperplasia, it may appear in one or both breasts, the symptoms are breast pain, nipple overflow and breast nodules. Common breast enlargement nodules change in size and texture with menstrual cycle or emotions. Usually the nodules become harder, larger and more painful before menstruation, and then these are reduced after menstruation and the breasts return to a softer state. MammaryDuctEctasia (MDE), also known as PlasmaCellMastitis (PCM), is a chronic benign disease of the breast with dilated ducts and plasma cell infiltration caused by a non-bacterial infection, usually in non-pregnant, lactating women between the ages of 30 and 40. Patients experience breast pain and discomfort and can palpate nodules located under the areola or extensions with hard, reddish skin, often with foul-smelling pinkish discharge from the nipples and often with sunken or deformed nipples. In advanced stages of the disease, the nodules may soften and form abscesses. Fibroadenoma of the breast: Fibroadenoma of the breast is a benign breast tumor commonly seen in young women, usually as a single nodule, but only occasionally in both breasts. Fibroadenoma usually develops slowly and is easily cured. It is usually found unintentionally when patients take a bath or during physical examination and has no special symptoms, only a few patients have breast pain or nipple overflow. Breast cancer: 80% of breast cancers are diagnosed because of breast nodules, which is one of the typical symptoms of breast cancer. The degree of nodules in the breast is a little more serious than ordinary breast enlargement, with hard lumps in the breast, no pressure pain, blurred outline, poor mobility, and can increase to several times the original size in a short period of time, and may also be accompanied by enlarged lymph nodes in the armpit or supraclavicular area, nipple invagination, and orange peel-like changes in the breast The skin is orange peel-like changes. 2. How to check whether a breast nodule is benign or malignant? Readers can refer to breast self-examination to identify potential crises and then undergo color ultrasound or pathological histology. The depth and location of the nodule can be determined by ultrasound examination. In benign tumors, the echo is usually uniform and low in volume, while in malignant tumors, the echo is diverse and uneven; while pathological histological examination can determine the nature of the nodule by examining the tissue through hollow puncture biopsy or excisional biopsy to determine whether the nodule is benign or not.