Breast cysts are usually not important and regular observation is sufficient, but treatment is needed if secondary infection causes acute inflammation. Breast cysts are a benign lesion of the female breast. The etiology is not yet clear, may be due to hormone level disorders, emotional reasons and other factors related. It manifests itself as a lump of different shapes and sizes, round or ovoid, with a smooth surface, clear borders and soft texture. Breast cysts generally do not need special treatment, regular follow-up observation can be. Regular follow-up of breast cysts can be improved by breast ultrasound and mammogram if necessary. However, some breast cysts may become infected, with symptoms of redness, heat, swelling, pain, and enlarged lymph nodes in the axilla of the same side, which require active anti-infection treatment. Patients with the above symptoms are advised to consult a doctor as soon as possible for active treatment under the doctor’s guidance.