Probably not, Brenda; it's probably something hormonal. If your mom's breast becomes hot/red/itchy/swollen/painful - i.e., exhibits more symptoms than just feeling warm - than she should definitely get it checked out, as it could be infected, or she could have a very rare form of breast cancer. But unless that happens, I'd tell her to keep her eye on things, and see if the warmth goes away, or changes to something more definite. Good luck to you both - PJH