Phillips, 21, complained of intense pain in his abdomen before he was taken to a doctor. The cause for the pain remains unclear, but people close to the singer think it may be gallstones, according to TMZ.
A source at the Georgia Pawn Shop where Phillips used to work told the site that the contestant was hospitalized for a similar condition in January.
Almost exactly one year ago, Idol Season 10 finalist Casey Abrams was hospitalized for severe stomach pains the day of the Top 13 results show and was forced to miss the taping. Abrams, who ended up finishing sixth, was also hospitalized during the Top 24 round.
A show rep could not be reached for comment on Phillips' status.