Nowadays, the mammogram, ultrasound and MRI reports of many hospitals are diagnosed as how many levels of breast changes BI-RADS, which causes unnecessary tension among some women, who think that level 2 or 3 is the possible stage 2 or 3 of cancer. In fact, BI-RADS is the “Breast Imaging Reporting and Data System” recommended by the American College of Radiology, which is a more standardized report. The significance of each grade is as follows: Grade 0: Needs to be recalled and re-evaluated in conjunction with other examinations. This indicates that the information obtained from the examination may not be complete. Grade I: No abnormality is seen. Grade II: benign changes are considered and regular follow-up is recommended (e.g., once a year). Grade III: Benign disease is possible, but a shorter follow-up period (e.g., once every 3-6 months) is required. The percentage of malignancy at this level is less than 2%. Grade IV: There are abnormalities that cannot completely exclude the possibility of malignant lesions and require biopsy for clarification. Grade IVa: low likelihood of predisposition to malignancy. Grade IVb: moderate likelihood of malignancy. Grade IVc: high probability of malignancy. Grade V: High suspicion of malignant lesion (almost identified as malignant disease), requiring surgical excisional biopsy. Grade VI: Malignant lesion has been confirmed by pathology. Of course, the above is only to determine the degree of breast disease from the imaging, the specific situation should be combined with the clinician’s judgment to comprehensive analysis.