Postpartum breastfeeding chest tingling may be caused by mastitis, skin eczema or mammary gland injury. 1. Mastitis: Because the milk ducts go straight to the nipple, if the nipple is not cleaned in time, bacterial infection will occur, and the bacteria will infect the mammary glands in a retrograde way, or because of not breastfeeding in time, or not sucking out the excess milk with a breast pump, which will trigger mastitis and lead to the patient’s chest stinging pain when breastfeeding after delivery. 2. Skin eczema: Inflammation of the skin, food allergy, humid environment and other factors may cause eczema on the breast skin, resulting in tingling in the breasts. 3. Mammary gland injury: the baby bites through the nipple during sucking, resulting in nipple injury, so the pregnant woman’s breasts sting when breastfeeding after delivery. Patients with breast stinging pain after breastfeeding are advised to go to the hospital to find out the cause of the disease and follow the doctor’s advice to avoid delaying the condition.