Not sure what it is.
Nursing 8 month old DS, who now has 4 teeth but has not bitten me (yet). He nursed a lot more than usual over the last couple of days and is snotty from recent chest infection but frequent nursing shouldn't make things this painful/sore.
I have tried being more careful with positioning and that helps a little. Nursing my toddler is only slightly painful but nursing the baby is so hard at the moment.
Don't think it is thrush, pain is in nipples when feeding and my breasts look normal no hard patches etc.
Any other suggestions I am starting to dread DS asking for his next feed.