Poor sound transmission of breast cysts is generally not serious, mainly due to the turbidity of the fluid inside the cyst. Breast cyst is a common clinical breast disease, the specific cause is still unclear, clinical considerations and the patient’s body estrogen level is too high, lobular degenerative changes and other factors. Normal breast cysts are filled with liquid, when the liquid texture is clearer, the patient’s examination can suggest that the transmittance is uniform, poor transmittance is usually due to the presence of infection, inflammation, or bleeding within the cyst, resulting in turbid liquid texture. Poor sound transmission of breast cysts is generally not serious, as the disease itself is mostly benign, as long as the diameter of the patient’s cyst is not more than 1cm, it can be left untreated for the time being, and regular follow-up can be done according to the doctor’s instructions. If the diameter of the cyst is more than 1cm, the cyst can be removed surgically, but the decision of whether or not to operate should be made by the doctor according to the patient’s condition. Some patients with poorly transmissible breast cysts will regress on their own without special treatment, and even if the patient undergoes surgery, the prognosis is still good, so the patient does not need to worry too much.