Harwell's manager confirmed to Billboard that he was taken to the hospital but it "was not an emergency situation."
"Whenever he is not feeling great, we take precautionary measures just to make sure everything is OK, especially while he is on the road touring.
"The doctor is running some tests, but he appears to be just fine and intends to resume the tour tomorrow night in Portsmouth, Ohio. We are rescheduling the show for tonight in Edwardsville, Illinois," the manager said.
However, rescheduled dates for the postponed concerts have not been announced as of yet.
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