For emergency. For example there was an accident and your place is far from the hospital you can use first aid treatment to reduce the danger.
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First aid is important because it is the essential primary care given to an injured person hence the name, "first aid". If a person were simply thrown in the back of the ambulance on route to a hospital then it would be possible that he or she could bleed out where as if proper first aid were given they might have lived.
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