Motorhead were scheduled to perform this past Saturday's in Austria at the See-Rock festival and the Tuesday in Milan, Italy, but have bowed out of the See-Rock Festival at the last minute due to a health issue with frontman Lemmy Kilmister. Festival organizers reported the news on their website, stating: "The band regret it very much but will make it up to all the fans as soon as possible." The festival's Facebook page goes on to add that the cancellation had to do with a serious health issue concerning Lemmy. The frontman reportedly suffered an acute hematoma and his doctor asked him not to travel. The specifics of Kilmister's condition have not been discussed any further. This is the second piece of troubling health news to recently emerge regarding Lemmy. Last week it was learned that he has been fitted with a defibrillator to help with undisclosed heart problems.