nipple inversion, when it is a new finding, can be due to a few things, but cancer is definitly on the list, and needs an evaluation. Mammograms don't always show what's going on.
thank you for answering my question!
Dear nichols32: If your mother has never had inverted nipples and this is only happening on one side, I would recommend that she see a breast specialist. Regarding the soreness, breast cancer is not usually painful and the fact that both of her breasts hurt reinforces that the pain is probably not related to a cancer.