Joe Jonas was examined by medics on Sunday (18Dec11) after he visited a hospital complaining of mystery stomach pains.
The Jonas Brothers singer checked into the emergency room at Children's Hospital Los Angeles with severe cramps in his abdomen, according to TMZ.com.
It followed a night of partying in Chicago, Illinois.
The website reports the star was only at the hospital for a short time, and there are no details of the cause of his condition. He was later seen eating out at a sushi restaurant with his brother and bandmate Nick on Sunday evening.