Head
Actually, pressure is not a good thing for head injuries. A cold pack if necessary and be very very gentle with the head. It's all too easy to apply too much pressure, especially if you're a little paniced, and that can cause damage to the brain. Better to swell and bleed externally than internally.
Unconsciousness, vomiting, blurred vision, nausea, disorientation, lasting dizziness, excessive swelling, uncontrolled bleeding, blood that pulses from a wound rather than just flowing smoothly, unclear speech, or if the person can't answer simple questions correctly, all require medical attention.
The hardest head injuries to deal with are the ones where there seems to be little external damage but the brain has been literally rattled inside the scull. The brain can suffer damage just by pressure alone. Imagine getting an egg and shaking it violently. When you crack the egg shell you can find that the yolk has been broken and the egg is scrambled in the shell. This is why we never shake babies or children. Even if there isn't a bump, cut or bruise, for a little while after a child hits their head we should keep an eye out for the less physical signs of damage.
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