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Donald Glover shocked fans with a jaw-dropping confession ... revealing a stroke and multiple health scares were the real reasons behind the sudden cancellation of his New World Tour.

The artist opened up during his set at the Camp Flog Gnaw Festival on Saturday, telling fans things got serious fast while he was on the road last year.

"I had a really bad pain in my head in Louisiana, and I did the show anyway," he told the crowd. "I couldn't really see well, so when we went to Houston, I went to the hospital, and the doctor was like, 'You had a stroke.' And the first thing I thought was like, 'Oh, here I am still copying Jamie Foxx .'"

The health scare didn't end there ... he went on to reveal he also broke his foot, and doctors later found a hole in his heart requiring t

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