Allman's official site and Facebook made no mention of the hospitalization as of Wednesday night, but his Facebook page did announce that Tuesday night's concert in Boise, ID had been postponed with the new date to be announced.

The news of the hospitalization came from a report from Oregon Live. The publication reported that Allman checked himself into a hospital on Monday but did not indicate what caused the veteran rocker to do so.

Peter Dammann, the artistic director of the Waterfront Blues Festival, said on Monday that Allman was canceling his entire tour including Sunday's appearance at the festival.

"He decided to cancel the gig tonight in Boise yesterday," Dammann said on Monday. "This morning I called up his agent and said, 'What's going on?' They said, 'We're evaluating, we'll get back to you.'