Joe Jonas — Rushed to ER with Pain in the Abs

1218_joe_jonas_EX_01Joe Jonas checked into an emergency room in L.A. while doctors inspected his abs — for severe stomach pains — 48 hours after Joe did some late night partying in Chicago.

A rep for Joe confirms he went to the emergency room at Children”s Hospital L.A. on Sunday. We”re told Joe was only at the hospital briefly … and it”s not clear what was wrong with him.

One potential hint — on Friday night (into Saturday morning) Joe was out at a Chicago hot spot Board Room Nightclub (above) partying after his concert.

Whatever the problem was … Joe felt good enough to eat out Sunday night  — we spotted him and his bro Nick leaving Katsuya last night. Sushi after stomach troubles Risky, Joe.