Joe Jonas has assured fans he's feeling "fine" following a brief hospitalisation on Sunday (18Dec11).

The Jonas Brothers singer checked into the emergency room at Children's Hospital Los Angeles with severe cramps in his abdomen, but he was discharged shortly after receiving treatment.

Hours later he was later seen dining out at a sushi restaurant with his brother and bandmate Nick, and now he's taken to his Twitter.com blog to thank his followers for their outpouring of support.

In a post on Monday (19Dec11), Jonas writes, "Hey everyone I'm fine I'm fine :-) thanks for the concern."