Viewers of American Idol’s Thursday results show found that the Top 13 was curiously whittled down to 12 for the entire broadcast -- Casey Abrams is back in the hospital.

The singer nearly missed his shot at Idol stardom on February 24, when he was rushed to the hospital following a rehearsal. At that time, show insiders stated that if Abrams could not pull himself together before his scheduled performance, he would not stay in the competition.

But Abrams didn’t dodge this new bullet. FOX has had almost nothing to offer on Casey’s status, health-wise or show-wise, but we do know he received a blood transfusion during his first hospital stay.

The treatment seems to support one theory. The Idol 360 blog is reporting that Abrams suffers from stomach bleeding when he gets nervous, a condition the blog proposes may be a peptic ulcer.

Symptoms of a peptic ulcer include burning, aching pain and extreme vomiting that may contain blood. The condition is not serious and may be managed with medication. But, Casey could just as easily suffer from any number of stomach ailments, including IBS or a gallbladder infection. And we are by no means medical professionals, or capable of determining the cause of his health problems.

Incidentally, Thursday’s episode was the first time a contestant has missed a results show due to hospitalization since season 2. Stay up-to-date on all this season's recaps, gossip and spoilers -- read all our American Idol 10 posts.