The probability of breast cancer is generally less than 2% for grade 3 breast nodules, but it is necessary for patients to be vigilant and confirm the diagnosis of suspicious lesions through pathologic examination as early as possible. Breast nodules can be diagnosed if lump-like lesions are found in the breast during daily checkups and ultrasound and mammogram examinations. Common breast nodular lesions include breast cysts, inflammatory nodules, breast lipomas, breast fibroids, breast sarcomas, breast cancers, and breast hyperplastic nodules. There are both benign and malignant lesions. During the examination, the nature of the lesion will be graded according to the size of the nodule, morphology and structure of the information, such as benign and malignant nature of the lesion. There are generally 7 grades, with benign lesions in grades 1 to 3. However, malignant lesions such as breast cancer may also be present in grade 3 nodules, although the probability is generally less than 2%. Therefore, patients with grade 3 breast nodules should be vigilant and closely monitor the development of their condition. If rapid progression or suspicious lesions are detected during follow-up, early diagnosis of the lesions through pathologic examination and active treatment are necessary to avoid missed diagnosis of malignant lesions such as breast cancer.