Breast nodules category 3 9mm*5mm usually do not require surgical treatment. Breast nodules are more common in women and are often categorized using the BI-RADS classification, which consists of 7 categories, and is useful in evaluating the benignity and malignancy of breast nodules, etc. Among them, 3 categories of nodules suggest that breast nodules are highly likely to be benign, and the probability of malignancy is 2%-10%. If the size of breast nodule is 9mm*5mm, the possibility of benign breast nodule is high, the degree of malignancy is very low, and it may not cause clinical symptoms related to the breast, generally do not need surgical treatment, but should be examined regularly. However, regular checkups should be performed. If the nodule grows rapidly in a short period of time and is accompanied by breast pain, surgery may be considered. If the breast nodule suggests category 3, it is recommended to monitor the situation of the breast nodule with regular checkups, and if there is a tendency of malignant transformation, standardized treatment should be carried out under the guidance of the doctor.