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(Yahoo!) - Reigning "American Idol" champ Phillip Phillips, who has a long and well-documented history of kidney stone problems, has postponed the remainder of his college tour due to illness.

This sad news was first revealed in a Sunday press release issued by the University of Wisconsin, Eau Claire; the Season 11 winner was set to perform with special guest Gin Wigmore on the campus tonight (Monday, May 6). But that concert and eight others--including a show in Dublin, Ireland--have been scrapped for now.

The word is the dates had to be rescheduled due to exhaustion, dehydration, and kidney failure; there's no confirmation yet regarding whether Phillip will be well enough appear in any way on the Season 12 "American Idol" finale, which takes place next Thursday, May 16. (It is customary for the previous season's winner to perform on the current "Idol" finale; only two past winners, Fantasia and Lee DeWyze, have not done so, but Lee still attended.)

However, from the looks of Phillip's upbeat tweet, it doesn't seem like his health issues will affect his big upcoming tour with John Mayer, which is set to kick off July 6--so that's the good news.


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