A grade 3 breast lump is usually a benign lump, but malignant lesions may also be present. Benign and malignant masses can be differentiated in several ways. Different rates of disease progression, different palpation patterns, and different degrees of severity. 1. Disease course progresses at different speeds: usually most of the malignant tumors of the breast grow faster, and may suddenly appear in a short period of time, and after a few months of development, the tumor has often developed larger. Benign breast lumps usually grow more slowly. 2. palpation is different: in the clinic all types of breast malignant tumors, usually the texture is more hard, the local mobility is poor, the border is not clear, the outside of the tumor is relatively rough. Benign breast tumors are usually smoother on the outside, can be moved when touched, and are generally more regular in shape. 3. Different degrees of severity: malignant tumors tend to develop more quickly, if not treated in time, there may be proliferation and metastasis, resulting in damage to the patient’s health. Benign tumors grow more slowly, some small lumps will not cause patients to symptoms, and will not appear metastatic spread of the situation. However, the gold standard for determining the benign and malignant nature of breast lumps is still pathological examination, and the above description is only a possible difference between benign and malignant tumors. It is recommended that patients with grade 3 breast lumps should go to the hospital in time and receive standardized treatment under the guidance of the doctor.