Mammography, also known as mammogram, is a very common imaging method for breast examinations. It is easy to perform, non-invasive, painless and has high resolution, and is meaningful for the diagnosis of common and multiple diseases of the breast, mostly in conjunction with breast ultrasound. First, underwear must be removed; second, the results are more accurate 3-5 days after menstruation; third, the operation will squeeze the breast, which is a bit uncomfortable, and four photos need to be taken, with bilateral axial position and bilateral lateral or oblique position, so that the observation is more comprehensive and the results are clearer; fourth, the X-ray used for the examination is radioactive, so pregnant women or women who are planning to get pregnant should not take the test. Therefore, it is not recommended for pregnant women or women who are planning to get pregnant.