"Dancing with the Stars" performer Julianne Hough opens up about the events that led to her hospital visit after last night's show -- and why she hid her illness from everyone.

Julianne was experiencing stomach problems all day but tried to be a "trooper" and not tell anyone, she writes on the website Fancast. "I didn't want to be dramatic about things… I don't know if anyone could see my face during the show, but I was trying so hard to put a smile on. I was in so much pain."

Julianne says she powered through the dance routine but then her sickness got worse. "Afterward, I went backstage and curled up in a ball. That's when everyone said I needed to go to the hospital…It's weird how I danced through it…But the minute I stopped, it hit me."

Lucky for Julianne her tummy troubles were not major. "With stomach problems, you never know what's going on. It could've been appendicitis. It turned out just to be a bad stomach."

Look for Julianne next week on ABC's "DWTS" when she and her partner Cody Linley dance the Samba!