Breast cysts over 10mm are clinically large and usually require intervention. Breast cysts are caused by breast hyperplasia, abnormal structure of breast ducts, hormonal changes, etc. They are common in young and middle-aged women and often have no obvious symptoms. Simple breast cysts are usually less than 10mm; if breast cysts are larger than 30mm and have obvious uncomfortable symptoms, they should be intervened as early as possible, with surgical excision as the mainstay. Breast cysts are often characterized by breast lumps and nipple discharge, and may appear alone or in multiple cases. Benign cysts can be cured by surgical excision, while malignant cysts require comprehensive treatment mainly by surgical excision, which should be recommended by clinicians. If the breast cyst is more than 10mm, you should consult a doctor in time, under the regular guidance of the doctor’s treatment.