I have been a little worried about Lemmy Kilmister of Motorhead. He has had some serious health issues lately that have led him to cancelling concerts all over the world.

After getting a defibrillator implanted into his chest, Lemmy developed severe hematoma.

According to Lemmy's Facebook Page:

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 says: 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.