Illness is forcing the cancellation of eight concerts by blues legend B.B. King, who was worked with Eric Clapton, the Rolling Stones, Peter Frampton, Joe Cocker, U2 and David Gilmour over the years.

"Mr. King fell ill (Friday, October 3) during his performance at the House of Blues in Chicago," according to a statement posted on King's official website. "He was immediately evaluated by a doctor and diagnosed with dehydration and suffering from exhaustion, whereby causing the eight remaining shows of his current tour to be cancelled."

Among the shows that King, 89, will miss are those at his own B.B. King Blues Club in Times Square, scheduled for October 12-13. His site had no further information on King's condition.

King has appeared on Clapton's 'Crossroads' concert bills, and recorded 2000's 'Riding with the King' with him, as well. He has also been featured on Frampton's 'Guitar Circus' tours. 'Deuces Wild,' issued in 1997, found King collaborating with Cocker, Gilmour, Bonnie Raitt, the Stones and others. His collaboration with U2, 'When Love Comes to Town,' was a No. 6 UK in 1989.

King suffered a public health scare earlier this year, when he was forced to issue a public apology after an erratic performance in April at St. Louis. The issue, King's management said then, was a missed dose of prescription medicine.