What are the causes of mastitis?

　　1. Milk stasis:

　　Milk stasis is conducive to the growth and reproduction of invading bacteria. The reasons are:

　　①The nipples are too small or inverted, which hinders breastfeeding. Pregnant women fail to correct the inverted nipples in time before delivery. baby Difficulty pumping breast milk；

　　②Excessive milk and incomplete emptying. The mother did not empty the excess milk from the breast in time.；

　　③Blocked milk ducts, inflammation of the milk ducts themselves, tumors and external pressure, and fibers falling off from bras can also block the milk ducts.

　　2. Invasion of bacteria

　　When the nipple is inverted, it is difficult for the baby to suck milk, and it is easy to cause damage around the nipple, which is the main way for bacteria to invade along the lymphatic vessels and cause infection. In addition, babies often sleep with nipples in their mouths, which can also cause inflammation in the baby's mouth to directly invade and spread to the milk ducts, and then spread to the mammary gland interstitium, causing purulent infection. The pathogenic bacteria are golden yellow Grape Cocci are common.