Breast lumps are a common clinical manifestation of breast disease and are more commonly associated with mastitis, breast hyperplasia, and breast tumors. There is a 2%-10% chance that a breast lump reaching category 4a is a malignant breast tumor, but a tissue biopsy is required to determine the benignity or malignancy of a breast lump. If it is a benign tumor, the condition is mild and usually less serious; if it is a malignant tumor, the condition is more serious. The mass can be graded according to the size of the mass, whether the edges are smooth, whether there is blood flow and calcification in the mass and whether there are abnormal enlarged lymph nodes in the axilla, etc. The masses are clinically classified into 0-6 grades. Grade 4 and above have a certain possibility of malignancy, which can be divided into three subgrades of 4a, 4b and 4c according to the possibility of malignancy risk, with the possibility of deterioration of grade 4a being 2%-10%, grade 4b 10%-50% and grade 4c 50%-95%. Therefore, once a breast nodule with grade 4a lesion appears, it needs to be taken seriously and should be actively examined regularly, and puncture biopsy or surgical excision should be performed according to the doctor’s requirements to clarify the nature of the tumor and treat it as early as possible.