Chuck Berry Left a Chicago Show After Suffering “Exhaustion”

Chuck is TIRED!

CHUCK BERRY had to be escorted off the stage during a performance in Chicago on Saturday night . . . but it sounds like he's OK.  Chuck is 84 years old.

The promoter told TMZ Chuck was out of it from the on-set . . . quote, "Obviously, something was off . . . 15 minutes into the set it went from fine to something wasn't right.  He was starting songs mid-song, playing 15 seconds of a song."

 According to reports, Chuck was struggling with the guitar . . . and eventually slumped over a keyboard.  He was escorted backstage, where some paramedics checked him out.

He returned 15 minutes later, but he couldn't finish the set.  He was helped off a second time. 

 Chuck briefly returned AGAIN later . . . told the crowd he was all right . . . did one of his "duck walks" . . . and then left for good.