Limited dilatation of mammary ducts is a localized enlargement of the ducts of the breast. Limited dilatation of the mammary ducts can be caused by impaired drainage of the ducts, hormonal irritation, and infection. Patients who present with limited dilatation of the mammary ducts may have symptoms such as parareolar lumps, breast pain, and nipple discharge. If simple limited dilatation of breast milk ducts occurs, it is recommended to go to the hospital regularly for breast ultrasound and other examinations. In case of breast swelling and pain, breast nodules, it is recommended to undergo surgical excision, etc. under the guidance of a specialized doctor. If infection occurs, antibiotics such as penicillin, cephalosporin, etc. can be taken for treatment, and the medication should be used under the guidance of a doctor. If the patient has limited expansion of breast milk ducts, it is recommended that the patient consult a doctor in time and be treated under the diagnosis of a professional doctor.