Bilateral ductal dilatation is cystic hyperplasia of the breast, which is common in middle-aged women, mainly due to the imbalance of the ratio of estrogen and progesterone in the body, which leads to excessive hyperplasia and incomplete recuperation of the breast parenchyma. In some breast parenchyma components, the quality and quantity of female hormone receptors are abnormal, which makes the degree of hyperplasia of each part of the breast different, and can be treated symptomatically with Chinese herbal medicine. For limited cystic breast hyperplasia, it should be rechecked within 5 days of menstrual cleansing. If the lumps become softer or smaller and disappear, regular observation is sufficient. If the lumps do not subside significantly and malignant lesions are found in the localized lesions during observation, they should be excised and rapid pathological examination should be done.