Acute mastitis generally refers to lactational mastitis, which can occur at any time during lactation, but is more common in the beginning stages of lactation in primiparous women. The most common causes of acute mastitis are milk stasis and bacterial invasion. Therefore, the prevention of acute mastitis mainly targets these two aspects. Besides enhancing the immune system of the mother, it is crucial to maintain good breastfeeding habits. This includes cleaning the nipples and the baby's mouth before and after feeding, keeping the nipple area clean, minimizing damage to the nipple area, and controlling bacterial invasion.