Verified answer

why u asking, are u going to cut your veins? O_o

well, i don't really know how exactly do that pain feel like.. but when you see yourself bleeding nonstop (because vein has been cut), i'm not sure that you will think about the pain in that moment :/ maybe a little.. but you'd fell more in panic or whatever,

the pain should be like.. uhm you will certainly loose some energy because of blood loss, maybe you'll feel some headache and cannot breath normally.. also, you will have some feeling of burning, you'll feel that something ''big'' is cutten inside of you, and that big something is getting the most important part of your body out of you :) (the injury, the blood, from your body) ::):)

i dunno if it helps :)