The 2 types of breast cysts belong to benign lesions, the time of malignancy is not certain and there are large individual differences. Breast cysts include cystic hyperplasia and cumulus cysts, which are ductal epithelial hyperplasia caused by endocrine disorders, most of which are benign and have a small chance of malignant transformation. Breast cysts are mainly observed clinically and generally do not require surgery, and an annual review of breast ultrasound or mammogram is sufficient. If the breast cyst has a tendency to develop and increase in size, the patient may consider surgical excision, while attention should be paid to complete removal of the breast cyst. In addition, the typical clinical symptoms of breast cysts are breast swelling and pain with nodule-like changes of breast enlargement, mostly in bilateral breasts and occasionally unilateral, and the degree of pain is related to menstrual cycle, so if patients have the above symptoms, they should go to the breast surgery department of the hospital for clear diagnosis and symptomatic treatment.