External Bleeding
When a main artery is cut the victim can die in a matter of minutes, which means it is essential to stop the bleeding as quickly as possible. The best way to stop the bleeding is by direct pressure to the injury with a clean compress. If nothing else is available, you can use your hand.
To reduce blood loss, elevate the bleeding part of the body (only if there are no broken bones) equal to or above the level of the heart. If bleeding persists apply pressure to the supplying artery. For example, for an arm wound, apply pressure at the point between the elbow and the armpit. Hold the victim's arm at this point with your hand while pushing your thumb against the artery and bracing the opposite side of the arm with the flat surface of your fingers.

Internal Bleeding:
Internal bleeding is much more serious and is also hard to diagnose. It can be induced by a fall, sharp blow, or puncture. Symptoms include blood flowing from the nose, mouth or ears, paleness, weakness, nausea, restlessness and a weak rapid pulse.
In this situation it is best to keep the victim on their back but if breathing problems occur then you want to prop up the head slightly. If the victim loses consciousness turn him or her on their side and keep the head and chest lower than the hips. Get professional medical help immediately.