Yellowish overflow from the breasts can be more serious as it can be caused by breast hyperplasia, mastitis, breast cancer and other factors. It can be treated with medication, 1. Breast Hyperplasia: The yellowish discharge from the breasts occurs in the case of breast hyperplasia and is mostly related to the menstrual cycle. The main manifestation is cyclic pain, and the breast can be touched with flaky thickening or nodular thickening lumps. 2. Mastitis: Mastitis is caused by bacterial invasion of the milk ducts and increased secretions in the ducts, resulting in yellowish breast discharge, which may also have a peculiar odor. It can be cured by surgical incision and drainage to drain out the pus, and then use antibiotic drugs to reduce inflammation. 3. Breast cancer: Some patients with breast cancer will have the symptom of yellow overflow from the nipple, because the tumor tissue and the milk ducts are close to each other, and the nipple overflow will appear after the tumor tissue is necrotic. Patients can be treated by surgery to remove the lesion. When the patient has yellow fluid flowing from the breast, go to the hospital in time and take corresponding treatment in time and use the medicine under the doctor’s guidance.