Ann Romney had a health ‘scare' ahead of Super Tuesday

— -- Ann Romney "had a little bit of a scare" about her multiple sclerosis in the days before Super Tuesday.

In an interview with "Entertainment Tonight," Romney, the wife of presumptive Republican presidential nominee Mitt Romney, says she felt "fatigued" as she campaigned alongside her husband ahead of March 6, when 10 states held primaries, but she kept it to herself.

"I was quite fatigued, and I knew I couldn't quit," Romney told the show's host, Nancy O'Dell, in an interview set to air Thursday. "I didn't tell anybody I was tired."

Romney was diagnosed in 1998 with multiple sclerosis and has learned to control the disease through diet and exercise, including horseback riding. But she admits to having off days—as she did in March.

"What happens with me is that I start to almost lose my words. I almost can't think. I can't get my words out," Romney told "Entertainment Tonight." "I start to stumble a little bit, and so those things were happening, and I thought, 'Uh oh, big trouble.'"

Romney's interview comes as she increases her profile on the campaign trail. While she often campaigns with her husband, Ann Romney has also started to maintain her own public schedule on the campaign trail, headlining dinners and events solo.

Last week, the Romney campaign marked her 63rd birthday by releasing a biographical Web video detailing her battles with breast cancer and multiple sclerosis—a story aimed not just at humanizing her but her husband's 2012 bid.

More popular Yahoo! News stories:

• Santorum and Romney to meet May 4, but endorsement may not come until later

• In the running mate spotlight, Marco Rubio shows off foreign policy chops

• In Delaware and Pennsylvania primaries, Mitt Romney sets a record he probably didn't want

Want more of our best political stories? Visit The Ticket or connect with us on Facebook, follow us on Twitter, or add us on Tumblr. Handy with a camera? Join our Election 2012 Flickr group to submit your photos of the campaign in action.