The band cut short a concert in Hamburg on Monday just 30 minutes into the performance as Meine struggled to deliver through the medical issue. "Sorry to all our fans," says the singer. "Thanks for your understanding. Hope we can make up for the concerts soon."

"Klaus Meine is currently undergoing medical treatment in order as quickly as possible to get the health problems under control again," adds the band. "This includes a medically pronounced 'stage ban' for the singer for several weeks. For this reason, any outstanding concerts have to be postponed."