Breast hyperplasia accompanied by enlarged lymph nodes may be caused by excessive estrogen secretion, mastitis and breast cancer. 1. Excessive secretion of estrogen: When the proportion of estrogen and progesterone is imbalanced, and the quality and quantity are abnormal, so that the breast parenchyma proliferates to varying degrees, the breast hyperplasia caused by it may also cause abnormalities in the surrounding lymphatic organs. 2. Mastitis: some patients with breast hyperplasia accompanied by mastitis may have enlarged lymph nodes due to localized inflammation of the breast, accompanied by pain, redness, swelling and overflow of the nipple. 3. Breast Cancer: Some patients with breast hyperplasia and breast cancer may suffer from lethargy and fatigue, breast lumps, nipple overflow and enlarged lymph nodes. Patients with breast hyperplasia lymph node enlargement should go to the hospital in time, clarify the cause of the disease and actively cooperate with the doctor’s treatment. And under the guidance of the doctor’s advice for medication, not to be taken privately, in order to avoid adverse effects.