A US man accidentally shot a three-inch nail into his brain -- and didn't realise until the following day.

Dante Autullo had been working in his Chicago workshop when a nailgun recoiled near his head, not feeling anything, he carried on.

It was only when he started suffering nausea the following day that he went to the hospital and doctors took an X-ray.

The X-ray revealed a three-inch nail had entered his brain, but because the brain doesn’t have pain-sensitive nerves he didn’t feel a thing.

After undergoing an operation to remove the remove the nail at Advocate Christ Medical Center, Autullo is now recovering well.

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