Symptoms can seem to appear suddenly and include: breast or chest tenderness or swelling on one or both sides, warmth of an area of the breast(s) or chest to the touch, thickening of breast or chest tissue or a lump, pain or a burning sensation continuously or while feeding the baby, redness of some of the skin on the breast(s) or chest, oftentimes in a wedge-shaped pattern, general malaise feeling (feeling like you have the flu), chills, body aches and a fever of 101F (38.3 C) or greater.