I was thinking it was a latch issue. Some times her latch gets uncomfortable when she's teething. But it only hurts on one side and even when she's being very careful it hurts. Maybe she bit it once and it still hurts from that, but she never bites. It was terribly painful to nurse her for a few days but now it doesn't seem quite as bad. What does thrush feel like? Can you get that on just one side? She hates it when I say ouch because she's quite sure she's not doing anything wrong. Any ideas?