Shady Records rapper Yelawolf was hospitalized after a concert in Madison, Wisconsin on Friday night.

Yela was also scheduled to perform at St. Andrew’s Hall in Detroit on March 6th. But this show has now been cancelled.

“He remains under observation for illness,” Live Nation said in a statement about the rapper. “At the request of his doctor, the show will be postponed to a later date.”

Tickets will be refunded.