With the widespread use of ultrasound equipment and the increasing awareness of health, more and more “problems” are being detected by ultrasound without any symptoms, causing a lot of confusion to women. Today, I would like to make a simple interpretation of ultrasound findings of “breast cysts” in the hope that it can help friends passing by. First, the reference value of ultrasound report. As a widely used instrument, ultrasound is used to scan the breast, mainly to detect “small lumps” that are out of the doctor’s reach, in order to prevent early breast cancer from being missed. Ultrasound is also used to help doctors identify whether a lump is substantial? Or is it cystic? Generally speaking, most tumors are substantial lumps, while most cystic lumps are benign, although a very small number of cystic lumps may be malignant. Therefore, when ultrasound reveals cystic nodules of different sizes in the breast, clinicians will refer to what they see on ultrasound, combined with whether there is nipple discharge? Whether or not you are breastfeeding” and so on to make a judgment. You will not usually see a cyst and recommend surgery, or suggest eliminating it. Second, the significance of breast cysts. A cyst can be large enough to be palpable by hand; it can also be observed by ultrasound but not by hand; or it can be indistinguishable by ultrasound but seen under a microscope. For breast, there is one or several large cysts, if it is not malignant, nor septic infection, nor any symptom, why do we have to eliminate it? But if this cyst grows inside the head, it will be unbearable, it will be headache, malignant, vomit, and even need emergency treatment. Third, what should the breast be concerned about? The real concern of breast is the early detection of breast cancer, because breast cancer has become the first malignant tumor in women, which seriously affects women’s life and health.