External bleeding usually occurs following a deep cut, piercing with a sharp object or a superficial bullet wound. The most serious bleeding comes rapidly spurting from an artery. This can be life-threatening if the wound is too deep and the spurt is under too much pressure to control. Minor bleeding usually stops by itself within ten minutes when a blood clot develops which blocks the bleeding vessel or wound. You should suspect life-threatening external bleeding if:

First aid supportive care for external bleeding

Apply direct PRESSURE to the wound, after removing any clothing or foreign body from the wound.
Help the person to lie down and ELEVATE the injured part above the level of the heart.
Apply a BANDAGE to the wound; it should be just tight enough to stop the bleeding, but not so tight that it obstructs the circulation.
Start intravenous (IV) fluid therapy with Normal Saline solution or Ringer Lactate solution if the person shows signs of shock. Transfer the patient to the nearest hospital or health facility immediately after you have begun the infusion.

What are the signs of shock following severe blood loss?

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A person who is in shock displays weakness, confusion or an altered state of consciousness, and has a fast pulse rate (over 100 beats per minute), and low blood pressure: the diastolic pressure (the bottom number) is below 60 mmHg.