burning nipples?

Rebecca
My little one is breastfed but I pump to store milk and increase my supply.  Over the last couple days I have noticed my nipples burning a bit.  Not constantly, but periodically throughout the day.  Anyone have similar pains or any recommendations?  If it is really bad I take some pain medicine the hospital sent me home with, I think it's just Advil, but it usually helps take the edge off.  Any advise is appreciated!