It's still girls vs. boys on "American Idol" -- just the other way around.

The 10 female semifinalists were scheduled to perform on "Idol" Tuesday and the 10 male singer Wednesday night, but unspecified "medical issues" with former Chicago musician Crystal Bowersox is causing a slight schedule change. Switch it: The men will sing at 8 p.m. Tuesday, the women 8 p.m. Wednesday.

The results show is still 8 p.m. Thursday, in which former finalist Danny Gokey performs his new single and two current semifinalists will be cut.

UPDATE: Us is reporting that Bowersox was hospitalized Tuesday, and the LA Times says it's possibly related to diabetes.

But while an "Idol" insider insists the Wednesday night show -- and Bowersox -- will go on, the NY Times cites "Idol" executive producer Ken Warwick saying she might miss tonight's performance, as well:

Mr. Warwick said that Ms. Bowersox had "a condition that we know about," but did not say what the condition was. He added that if she missed the show on Wednesay, she would all but certainly be eliminated.

"If you're in the Olympics," Mr. Warwick said, "and you're going for the semi-final, for the final, if you don't turn up, you don't get straight through to the final."

On Tuesday night's show, host Ryan Seacrest gave Bowersox, 24 and a mother of one, a shout-out: "Crystal, if you're watching, we hope you feel better very, very soon."

UPDATE AT 7:02 P.M.: Bowersox was the last of the ladies introduced to perform as "American Idol" kicked off Wednesday night.

Seacrest asked Bowersox how she was feeling, noting that the last 24 hours seemed to be tough for her.

"I feel good," Bowersox said, adding that she is a "tough cookie."

Seacrest responded: "You are a tough cookie."

Bowersox is the first to perform tonight.