Cystic nodules in both breasts are considered a symptom of breast cysts, and benign tumors are more likely. It is common in the following two cases: 1. Simple breast cyst. It may be that the milk is not completely discharged after the end of lactation, and the accumulation of milk leads to cysts. If there are no obvious discomfort symptoms, no obvious enlargement or abnormalities, ultrasound examination of the cyst fluid echogenicity uniformity, do not need treatment follow-up observation can be. 2, cystic hyperplasia of the mammary gland. Under the influence of hormone metabolism disorder and estrogen-progestin ratio imbalance in the body, cystic expansion of breast ducts leads to breast cysts, which can also be accompanied by benign hyperplasia of the parenchyma. If the cysts are accompanied by menstrual cycle and the symptoms can be relieved significantly after menstruation, they can be followed up for observation or symptomatic drug treatment; if the symptoms can not be relieved or there are suspected malignant lesions, surgical resection should be chosen for pathologic examination.