whats wrong with my cat ?

You need to take the cat to the vets.. What kind of idiot has a cat thats practically dying and asks on yahoo!? Get to the vets NOW

If this is a serious question, take the cat to the vet in case it may have been poisoned. Rat killer and other poisons can thin the blood causing this. This would be an emergency if this is truly happening with little time for error. Emergency vet if not faking it.

http://www.marvistavet.com/html/body_epistaxis__th...

NOTE THE COMMENT IN THE LINK ABOVE: "or the pet is having difficulty breathing, go to your vet’s office or local emergency clinic at once." Labored breathing is cause for concern.

http://www.petmd.com/cat/emergency/poisoning-toxic...

Call vet for advice.

I've had cats for years and I've never known blood to run from a cats nose? Has the cat been out...got into a fight? Or is something stuck in the cats nose? I'd reassure the cat with pats and try and investigate further. What has caused the nose to bleed?

It needs reformatting. Give it a memory upgrade too while you are at it,.

I bet your vet could tell you and even treat it.