Hi if you cut your vain on the wrist vertically and it heals on the outside how long does it take to heal on the inside?

What do you mean "heal" veins don't magicly grow back together unless you have surgary

If you cut your vein you would definitely know about it and it would be stupid not to seek medical attention - sometimes people don't even notice until they realize the blood won't stop flowing. Cutting a vein could cause serious damage. You will know when you have cut a vein as the blood is slightly darker. The blood will not pulsate out of your body but it will just keep flowing. I suggest you seek immediate medical attention if you cut a vein and I suggest visiting your GP for advice on mental health and self mutilation, they can help you get in touch with a councillor.