The former Sabbath guitarist is suffering from a debilitating condition in his fretting hand that leaves him in constant pain, and says his only course of action is to go under the knife.
"After this run, we're going to have some time off," he said. "I've got to have an operation on my hand. It's sort of a major thing I need to get done and I've been putting it off."
More at MusicRadar.com