Breast lumps during breastfeeding can be eliminated by massage and hot compresses if they are simple milk stagnation, or by medication or surgery if they are pathologic and difficult to eliminate quickly. Insufficient breastfeeding experience and incorrect posture during breastfeeding may lead to milk stagnation and hard lumps. Generally speaking, massage, hot compresses and stimulation of suckling by infants can reduce milk stagnation and make the hard lumps subside. Pathological conditions that lead to breastfeeding lumps include acute mastitis and breast cysts related to breastfeeding; breast hyperplasia related to hormonal changes during breastfeeding; and intraductal papilloma and breast cancer during breastfeeding, which need to be treated according to different diseases. Acute mastitis should be treated with penicillin and other antibiotics to fight infection, and abscesses should be incised and drained after abscess formation, and attention should be paid to timely emptying of the breast. If the breast cyst is small, it can be left untreated; if it is large, it can be aspirated by puncture, and if there are repeated infections and irregular nodules on the wall of the cyst, it can be surgically excised. Breast hyperplasia can be treated symptomatically, such as taking Prosperity powder to reduce the symptoms; the more serious symptoms can be treated with drugs such as tamoxifen, which is generally effective, but should not be taken for a long period of time, and breast hyperplasia manifested as a lump should also be followed by regular review. Breastfeeding combined with the occurrence of fibroids, breast cancer and other benign and malignant tumors is also difficult to subside quickly, generally need to carry out lumpectomy or radical surgery. It is recommended that patients with breast lumps during breastfeeding should consult a doctor for further examination to clarify the possible causes and diseases, and actively treat and manage the lumps.