Once a suspicious lump or abnormal change is palpated in the breast, you need to go to the hospital for a professional examination by a breast specialist, combined with some ancillary tests to assist in the diagnosis. Breast palpation: initial examination, painless and non-invasive. X-ray mammography: can detect cancers <5mm and has a high detection rate for calcified foci B ultrasound: economical, easy, non-invasive and painless, more suitable for young women, especially pregnant and lactating women. CT: It can improve the accuracy of diagnosis. MRI: higher resolution for small lesions. Pathological examination: It is necessary to confirm the diagnosis of breast cancer and is mainly used for mammogram and B ultrasound examination for suspicious cases.