The benign criteria of lobular breast tumor are clear boundary, no invasion, less than 5 nuclear schizophrenia under ten times high power microscope; the malignant criteria are local invasion or metastasis, more than 10 nuclear schizophrenia under ten times high power microscope. Lobular breast tumors are rare tumors, originating from mesenchymal tissues, often manifested as localized lumps, benign lumps tend to have clear, smooth surface, good mobility, and no nuclear schizophrenia under microscopic observation; malignant tumors have hard texture, unclear borders, and nuclear schizophrenia are common. It is recommended that the patient should consult the doctor in time, improve the imaging and pathological examination to clarify the nature of the tumor, choose the corresponding treatment method, and actively treat the tumor to avoid delaying the condition.