Category 3 nodules of 1.5cm in the breast require surgery if they are malignant, while some benign breast nodules can be treated with surgery or follow-up, conservative treatment. The BI-RADS (Breast Imaging Data System) classification is a malignant risk assessment of breast nodules based on breast ultrasound, mammogram and other imaging tests. One of the 3 categories is a high likelihood of benignity and a 0-2% probability of malignancy. And there is no direct relationship between breast nodule size and malignant risk. A category 3 breast nodule of 1.5 cm has a 0-2% probability of being caused by breast cancer, and there is a >98% probability that it is caused by benign tumors such as breast fibroma, intraductal papilloma, or non-neoplastic diseases such as plasma cell mastitis and breast cysts. If breast cancer is the cause, radical surgery is required, supplemented by chemotherapy, endocrine therapy and other comprehensive treatment. If it is caused by breast fibroma, the possibility of malignancy is low, and it can be followed up or treated with surgical excision; while intraductal papilloma has a malignancy rate of about 5%, and it is mostly recommended to be treated with surgery. Breast cysts that are more than 3cm, contain solid components, and have irregular protrusions on the wall of the cysts also require surgical treatment. Plasma cell mastitis can also be treated with surgical excision; cysts that are less than 3cm, acute mastitis, and breast hyperplasia can be treated symptomatically with medications such as Xiao Jin Wan, and followed up on a regular basis if necessary. Most of the 3 types of breast nodules are benign, and it is recommended that patients should consult the doctor in time and follow the doctor’s instructions to choose the appropriate treatment. The use of drugs should be under the guidance of a doctor