The British band axed a performance at Austria's See-Rock Festival last Saturday (22Jun13) and another show in Italy on Tuesday (25Jun13), and the promotion company behind the Milan gig suggested that the singer, who recently underwent heart surgery, was suffering with a "severe haematoma" - a localised collection of blood outside the blood vessels.
The report has not been confirmed by the group or by Lemmy, but the rockers have now cancelled another gig - their set at Germany's With Full Force festival on Friday night (28Jun13) will no longer take place.
However, a representative for the star has spoken out to re-assure fans about Lemmy's health.
A post on his Facebook.com page reads, "We are happy to announce that despite rumors to the contrary, Lemmy is alive, breathing, talking, f**king, drinking, eating, reading and will be back to playing shows shortly.
"As reported, he did undergo a Motor-pit-stop for some medical maintenance this past spring, and the timing of his recent illness was unfortunate in that it came so soon after that. Lemmy & Co believe in the 'keep calm and carry on' way of thinking. Fans can anticipate more Motorhead live action this summer..."