Steve Granitz / WireImage 1 / 8
Steve Granitz / WireImage 1 / 8

Pop star Joe Jonas has assured fans he's feeling fine following a brief hospitalization on Sunday.

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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.

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Hours later he was later seen dining out at a sushi restaurant with his brother and bandmate Nick, and he thanked his Twitter followers Monday for their outpouring of support.

He wrote, "Hey everyone I'm fine I'm fine :-) thanks for the concern."

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