Rock star Yungblud is due to break from touring until the end of the year following advice from a doctor.
The 28-year-old, from Doncaster, who is bringing the Idols World Tour to the UK next spring, was due to tour the US this month.
In a social media post, he said it was "in my nature to run and run until l run myself to the ground … but this time I've been told I have to take it seriously" after concerns were raised about his voice and blood tests.
He said his "heart is broken" and apologised to fans for cancelling shows in cities including Philadelphia, Cleveland and Washington.
"I don't want to do any lasting damage to myself, we are on a journey that I want to last forever," the singer said.
