I. Bacteria from the body surface of the breast during lactation enter the ducts of the breast to infect and multiply leading to a series of inflammatory reactions. Second, the most common causative agent of mastitis is Staphylococcus aureus, followed by Staphylococcus epidermidis, Streptococcus, and Escherichia coli. Third, lactose-rich milk stagnation in the mammary gland is an ideal environment for bacterial growth. Bacteria enter the mammary gland through the opening of the milk ducts in the nipple and multiply in the stagnant milk. Five, nipple surface skin rupture or ulceration makes the chance of mastitis significantly increased. The main manifestations of mastitis are localized skin redness, high skin temperature, swelling and pain in the breast, palpable lumps in the breast, rapid onset and short duration of the disease. Seven, the treatment of mastitis is based on anti-infection treatment, the antibiotics that can be used are mainly penicillins and cephalosporins, they have no significant damage to the baby. Eight, local inflammatory lumps of massage is also needed to disperse the local stagnant milk as well as the lumps formed due to infection can speed up the recovery of mastitis. You can massage the lumps yourself along the periphery towards the nipple, or you can ask a professional lactationist to help. The mastitis patient should continue to breastfeed, on the one hand, the mastitis-causing bacteria and the use of penicillin and cephalosporin antibiotics are harmless to the baby, on the other hand, continue to breastfeed can reduce the further accumulation of milk, reduce the pressure in the mammary gland, which is conducive to the recovery of mastitis. Prevention of mastitis: 1. Take turns and breastfeed regularly on both sides of the left and right mammary glands, aiming to empty one at a time, and if not, use a breast pump to suck out the milk to avoid stagnation as much as possible. 2. Keep the surfaces around the mammary glands clean, wash them with water several times a day and before and after breastfeeding. 3. Try to avoid squeezing the mammary glands, avoiding trauma and reducing the chance of skin breakdown on the nipple surface. If there is localized redness, swelling, heat, pain and lumps in the breast, you should seek timely medical attention and treatment to avoid the progression of mastitis to breast abscess. The mastitis without timely and effective treatment can soon progress to a breast abscess. In addition to anti-infection treatment, abscess incision and drainage is the most effective treatment for breast abscess. Some doctors advocate repeated aspiration and flushing of abscesses, but my personal experience is that this approach is not ideal. Thirteen, breast abscess under local anesthesia after incision and drainage try to continue breastfeeding, do not need to return to the breast, continue to breastfeeding is not harmful to the baby, is conducive to recovery.