Whether a breast cyst of 30 mm should be operated or not cannot be generalized, it needs to be combined with the nature and severity of the cyst as well as the patient’s own condition. It is generally believed that breast cysts of 20 millimeters or more can be treated with surgical excision. In addition, surgery should also be considered in the following cases, such as for breast cysts that cause pain, make the patient uneasy, psychological stress, and when the possibility of malignant changes cannot be ruled out. For breast cysts that are considered benign and asymptomatic, follow-up observation and regular checkups are the mainstay. In addition, we can also pay attention to diet, such as eating some light, easy-to-digest food, as well as eating some fresh fruits and vegetables, which are conducive to the patient’s health. It is important to note that when a breast cyst is detected, the decision of whether or not to operate should be made after a comprehensive assessment by a doctor, rather than making the diagnosis on your own to prevent delays in the condition.