The legendary frontman recently suffered a hematoma (where blood collects outside of a blood vessel), which caused Motorhead to pull out of three earlier dates; this came on the heels of news that the bassist had been fitted with a defibrillator because of heart problems.

"Regretfully, Motorhead announces it has had to cancel its remaining six summer festival appearances," said the group. "The band hate to let their fans down by missing any shows, but they expect to be back in full force this Fall."