The problem is your thumb is swelling and trying to pull your thumb nail off.
Stick it in ice and take some asprin or ibuprofen to reduce the swelling.
Have you got blood trapped under the nail? If so might be worth going to a walk in center where they'll drill a small hole in your thumb to let it out. I've had it happen twice, very very painful.
(PsychoChomp, Mon 20 Aug 2012, 15:38, 3 replies, latest was 13 years ago)

The nail has split & blood is leaking out of underneath it. Good idea about the asprin.

( Fucking hell Jeff I am not a robot, Mon 20 Aug 2012, 15:40, Reply)

Ahh not exactly the same as mine. Mine was hit with a hammer and trapped in bike frame.
So the blood couldn't get out. Still it's the swelling pulling against the nail that's causing that horrible pain so get the swelling down and you'll be ok.
(PsychoChomp, Mon 20 Aug 2012, 15:44, Reply)

Alternativley if you're a bit bear grylls, you can stick a paper clip into a cork.
Heat it on the hob until it's red hot and burn a hole through you nail to release the pressure.
(PsychoChomp, Mon 20 Aug 2012, 15:41, Reply)

and take photos to sjow us so we can lol

( Naked Ape call me Caitlyn, Mon 20 Aug 2012, 15:43, Reply)

He's already drilled into his nail
having someone else do it as well seems like an unlikely cure.
( the mighty badger Aphrodite, on a bar stool, by your side, Mon 20 Aug 2012, 15:42, Reply)

they could drill him a nice smiley face into it,
to cheer him up everytime he looks at it
( glued eel /questions/questionsyoudliketoask/post1648081, Mon 20 Aug 2012, 16:01, Reply)