The clinicians and diagnostic imaging doctors in the Breast Center of People’s Hospital are two in one. While we do comprehensive treatment of breast diseases, especially breast cancer, we are also responsible for breast imaging and diagnosis, such as breast ultrasound examination and diagnosis. As a breast specialist, I have found in my clinical practice that breast ultrasound can be helpful in establishing the diagnosis of many breast diseases and formulating subsequent treatment plans. The advantages of ultrasound are that it is inexpensive, non-invasive, and repeatable. Perhaps because of the popularity of color ultrasound, many people feel that it is a bit unsettling to just lie down, smear something on the breast, and then use a probe to determine if there is a problem or if cancer has grown. It is true that no test is foolproof, but the value of breast ultrasound for breast disease diagnosis cannot be ignored. So what kind of examination is ultrasound? The principle of ultrasound diagnosis is that ultrasound is emitted into the body and propagated through the tissues using an ultrasound instrument. When ultrasound waves pass through various different tissues, reflections and refractions of different amplitudes are generated, and these echo signals are processed to obtain a sonogram, and the nature of the lesion is judged according to the size, shape, contour boundary, echo type, internal situation of the echo and posterior attenuation of the lesion shown in the sonogram. Ultrasound examination of the breast can distinguish between cystic and substantial lesions, and can often detect 1cm or even smaller masses under the operation of experienced physicians. By analyzing the characteristics of the masses on the sonogram and the blood flow, the early detection rate of breast cancer can be maximized and unnecessary biopsies can be avoided. Theoretically, all people can undergo breast ultrasound examination. For routine health checkups, I recommend breast ultrasound for all people who plan to have a breast exam. Because it is a non-invasive test, there is no radiation and there is no pain, so it is recommended for routine breast ultrasound. In addition, for young people with dense breast tissue, breast ultrasound is more relevant. For the former, mammography requires a certain amount of radiation, so we do not routinely perform it without special suspicion; for the latter, the diagnostic rate of mammography decreases significantly, and ultrasound is needed to compensate. For us Chinese women, dense gland types are more common, so breast ultrasound is especially important. As mentioned above, there is no one test that can cover all, and breast ultrasound also has its shortcomings and limitations, but in the hands of experienced doctors breast ultrasound can become our “clairvoyant” in the diagnosis of breast diseases.