After calling off three shows last month, the ongoing health problems of Motörhead frontman Lemmy Kilmister has forced the band to pull the remainder of their upcoming European tour dates, including concerts in Germany, France and Russia.

According to Billboard, the singer was recently fitted with a implantable defibrillator to correct an irregular heartbeat,also suffering from hematoma.

The three-piece rock band made the following statement online:

“As you may have heard, earlier this Spring Lemmy had some medical maintenance for the long-term good, He was, at that time, advised to rest, but once feeling better, he of course resumed his life as usual. He has since been advised that he should immediately take some more time to rest.”

Lemmy also issued a statement, saying: “I’d like to thank everyone who wish me well, it was a tough decision for me as I don’t like to disappoint the fans especially in times where economy is bad and people spent their money to see us. But sometimes you can’t do anything else than following doctor’s orders, but be sure we will be back and kick everybody’s ass.”

The band will still release their 21st studio album Aftershock in September.

[via CoS]