Hey ladies, I noticed on my local board that some women were having a lot of pain while pumping. I was using lanolin and having pain (soreness, cracking, scabs and minor blistering.) I switched to using olive oil and was surprised at the huge difference it made. I think the thickness of lanolin actually made the friction worse and kept my nipples from getting a chance to dry out. I've also found that having the right size shield helped (I was using way too big.) Make sure your nipple and NOT a lot of your areola is what fits in the tube part. If you need an example see this link:
Good luck ladies!