Well you bleed a lot until the site clots or you bleed out (that could take several hours depending on the vein).
Body Piercing is not a hobby or recreational activity, it is a serious procedure that if done incorrectly can cause lasting long term damage to the body. Body Piercing is a service provided by trained and qualified professionals in a controlled environment using only sterilized materials and bio-compatible body jewellery designed for specific piercings. This is site is not designed or intended to provide users with "how to information" that could cause serious injury to themselves or others from the use of posted information. See a professional body piercer for all your piercings.
The reasons you should not attempt to pierce your self should be obvious, but for those who think it's a "DIY" project, here's some food for thought.
Infection and contraction of MRSA, HIV, Meningitis, Hepatitis and Tetanus are all very serious health issues, MRSA is an antibiotic resistant bacteria that can in most cases land the unlucky individual in the hospital (and has been responsible for serious deformities and deaths). These infections has been caused by using unsterilized equipment and materials. Sterilization is not achieved by pouring alcohol over needles and jewellery, or burning these items over a fire or exposed flame. Microorganisms live in the fine fissures and cracks in needles and jewellery and only the high temperature and pressure of a steam Autoclave can render these and many other bacteria harmless.
The above reasons alone should be enough to sway anyone from thinking they can do it themselves. Professional body piercers have years of hands on training and education to enable them to make any piercing "look simple", when in fact they are considering dozens of things when they lay out a piercing and actually do it. So consider your lack of knowledge, training and skills before you attempt to do any self piercing, once you pierce it, it's damaged tissue. This makes it even more difficult for a professional piercer to leave you with a great looking piercing when the area we have to work with is damaged by self inflicted attempts.
Well... if you are piercing your cartilage, you won't hit a vein. On other places it is possible to hit a vein, and if it's major, you could bleed to death... But I'd imagine you'd get help before that happened. ^^^^^ You CAN hit a vein, but not ALL of your blood is in your ears. So I HIGHLY doubt if you perhaps did hit a vein, that you could bleed to death. None the less you may bleed a lot though. It truly depends on if your a bleeder, or not!
it would hurt
when you hit the blood vein
Unlikely, although hitting a vein does increase the chance of an infection.
It depends where but if you hit any artery or vein it is a problem.
Nurse messed up
Doing it slowly may help
You'll hit the vein and they'll bleed to death.
The Superficial Vein is not an antecubital vein.
The Brachial Vein is a deep vein in the arm.
The Testicular Vein and then into the Penisial Vein.
The ulnar vein is a deep vein.