Hard lumps in breastfeeding breasts are usually caused by milk stagnation, which can be treated by massage, breast pump, medication and surgery. 1. Massage: massage in the direction of the milk ducts, gentle techniques, in order not to cause pain is appropriate, can help milk discharge, it is recommended to have professional medical care, so as not to cause damage to the mammary gland. 2. Breast pump: If the milk is stagnant and you can’t breastfeed normally, you can suck out the stagnant milk through the breast pump. 4. medication: for acute mastitis you can use antibiotics to control the symptoms, such as amoxicillin and other drugs, and if you have cystic breast hyperplasia, you can use tamoxifen, for example, to treat it. 5. Surgery: If an abscess forms, surgery is needed to incise and drain it. At the same time, hard lumps in breasts during lactation can be seen in breast nodules, which can be secondary to acute mastitis, cystic hyperplasia of the breast and other diseases, and there is also the possibility of breast cancer during lactation. There are many causes of breastfeeding hard lumps, breastfeeding breast hard lumps recommend timely medical care, clear diagnosis of the disease under the guidance of the doctor standardized treatment.