According to reports, Jimmy Fallon canceled his show Friday after he reportedly fell and seriously injured his hand sometime “early this morning.”

The injury was severe enough to require surgery, TMZ reports.

After taping his show on Thursday ... we know Jimmy did dinner at Upper East Side restaurant Scalinatella. He posed for pics with a table full of female fans.

We’re told Jimmy left the restaurant around 9ish ... and went home.

His rep says the injury to his left hand happened early this morning in his apartment. He went to the hospital, and a specialist recommended he have surgery immediately.

A restaurant employee tells the New York Daily News he appeared “fine” when he left Thursday night.

Wonder what happened...

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