Overview Mastitis is an infection that occurs in the tissue of one or both of the mammary glands inside the breasts. According to best lady gynaecologist in Gurgaon , mastitis usually affects women who are producing milk and breastfeeding. Mastitis often causes a hard, sore spot inside the breast. It often develops during the first 3 months after giving birth, but it can occur up to 2 years later. As for its cause, the best gynae doctor in Gurgaon who works at the leading mother care hospitals in Gurgaon , says that mastitis is often a result of a blocked or plugged duct. Anything that stops the milk from being properly expressed will usually result in milk stasis (milk remaining in the breast), and this often leads to milk duct blockages. Symptoms Signs or symptoms of mastitis may develop rapidly, as the gynaecologist doctor in Gurgaon explains. These symptoms can include: An area of the breast becoming red and swollen The affected area of the breast hurting