Acute mastitis patients are mostly seen in breastfeeding women, especially primiparous women, when there is milk stagnation, bacterial invasion, the patient may appear red, swollen, hot and painful typical manifestations, or even pus to form an abscess. 1. Breast milk stagnation: When breastfeeding women do not discharge breast milk in time due to breast pressure during breastfeeding or breast tumors compressing the milk ducts, the stagnant milk will provide a good environment for bacteria to grow and reproduce, making it easier for acute mastitis to form. 2. Bacterial invasion: the more common cause of nipple skin rupture, mostly due to the lack of breastfeeding experience of the first-time mothers, the baby long time to hold the nipple caused by the invasion of bacteria will cause the breast tissue red, swollen, hot and painful symptoms. When it comes to acute mastitis, it is important to empty the breast milk on time and use amoxicillin and other antibacterial drugs as prescribed by the doctor to fight infection; when a breast abscess is formed, it is necessary to give incision and drainage, and then change the medication on time until it is fully recovered. If you find acute mastitis, please consult the hospital in time, use drugs or choose other suitable treatment methods under the guidance of professional physicians, and actively treat it.