Pathological examination is the gold standard for confirming the diagnosis of breast cancer. Breast cancer examination includes the following: 1) breast cancer checkup by clinicians, which is the simplest and most convenient, but the result of the checkup depends on the experience of clinicians; 2) breast ultrasonography, which is used in specialized hospitals, which is simple, convenient, and less damaging, and the ultrasonography is also very much related to the experience of clinicians; 3) mammography, which is relatively popular, but it is painful and has radiation, and it is only for patients with risk factors after 35 years of age. 3, Mammogram, this is a relatively popular examination, but the examination has a certain degree of pain, the need to squeeze the breast, and there is radiation, only for patients with high-risk factors after the age of 35. For young patients with dense breasts, molybdenum mammography is not recommended as a routine checkup, and ultrasonography is more convenient; 4, mammography, which has a higher diagnostic rate, but there is a certain amount of false positives, and drugs will be injected during the checkup, and the cost is relatively high. However, for patients who are not clearly diagnosed and treated or have the requirement of breast conservation, they can selectively do breast MRI. 5. The most accurate means of examination for breast cancer relies on the puncture biopsy of breast lumps, which is the gold standard for the diagnosis of breast cancer.