I have interviewed and hired many, many people over the years and I would advise against saying anything. I say this for two reasons:
1 - While a potential employer cannot LEGALLY discriminate against you, they can decide against hiring you for lots of other "reasons" I know this sounds harsh, but it is a reality in business. And it is human nature.
2 - Also, I have been taught that it just isn't professional to talk about personal information on interviews. I have to tell you I have been very uncomfortable when people start talking about their personal business while I am interviewing them.
Good luck! And I hope this didn't sound too cold :-(
35 year old female - Diagnosed w/Crohn's 2002 - Surgery 2004
Currently taking: Pentasa, Entocort, Imuran, Immodium, Zoloft, Wellbutrin, Seroquel