Breast nodules are not necessarily breast cancer. Currently, breast cancer screening is mainly done through ultrasound and molybdenum imaging. Breast nodules are categorized into one to six, with one to three basically considered benign and four suspected of having malignant potential. Generally, the higher the classification level, the higher the likelihood of malignancy, with up to 50% malignancy in category four and 95% malignancy in category five. When getting the ultrasound results, one should pay attention to the classification of breast nodules: category 1 is basically considered normal breast changes, category 2 is basically breast cysts, which are 100% benign, and most of the category 3 nodules are benign hyperplastic breast nodules or fibroadenomas, which are also benign in more than 98% of cases. The patient should follow the advice of the attending physician for further follow-up or treatment. If a category 4 nodule is present, the patient is advised to consult a breast surgeon immediately, and a puncture biopsy or excisional biopsy is required to clarify the nature of the lesion. If there are five types of nodules, the possibility of malignancy is very high, so be vigilant and go to the breast surgery department of a regular hospital in a timely manner. Category VI nodules indicate that there has been a puncture pathology diagnosis of malignant nodules.