Bassist Stevie Benton began to feel ill during Wednesday night's performance at Stone's Throw in Eau Claire, Wis., and afterwards was admitted to the Luther Midelfort Hospital where a doctor diagnosed him with the neurological disorder Bell's Palsy.

The disease causes paralysis of the face and sometimes sensitivity to sound, representatives for the band said in a statement. In most cases, the disease is temporary and, with proper rest, resolves on its own.

Doctors have ordered Benton to take it easy for a minimum of six weeks, the statement said.

"I'm really bummed that because of this, we can't perform this last string of shows," Benton said. "I want to thank the fans for their continued support and, believe me, when I say we can't wait to come back and rock out with you all again soon."

The band has been donating money from its tour to the Iraq and Afghanistan Veterans of America and the USO.