Joe Jonas was rushed to an LA hospital two days after doing some serious partying at Chicago's Board Room Nightclub.
Emergency room doctors inspected his abs after Joe complained of severe stomach pains.
Joe performed in Chicago after spending Friday night and Saturday morning partying in the city, which could've caused his pains.
The pains could also be a result of food poisoning from Katsuya. The Jonas Brother ate at the LA hot-spot with his brother Nick on Sunday.
Joe says he feels fine and thanks his fans for their concern.