The three categories of breast cysts are generally benign with a high likelihood of not being serious; however, there is a smaller risk that malignant tumors may be present, and if malignancy is diagnosed it suggests a more serious condition. Breast cysts are benign diseases of the breast and may be simple cysts due to endocrine disruption or cumulus cysts due to milk stagnation, etc. The Breast Imaging Reporting and Data System (BIRDS) classification is an assessment of the benignity or malignancy of a nodule based on breast ultrasound, mammogram, and other imaging studies. Category III means that the nodule is more likely to be benign and the probability of malignancy is 0% to 2%. Generally breast cyst category three patients with a high probability of benign, is not serious, most of the follow-up observation can be done without treatment. However, breast cysts three categories also have a certain risk of malignant tumors, more anxious patients and cysts larger than 3cm, cysts within the solid components, the presence of irregular protrusions of the cyst wall can choose to perform surgical removal of cysts. It is recommended that patients go to the hospital in time to consult a specialist.