A Wonderleaf question

a real page from the book
We feel pain because nerves warn the brain that part of the body may be in trouble. Sensors called nociceptors respond to strong heat, pressure, or injury, and the brain turns those messages into a feeling that makes you stop, protect the spot, and learn for next time.
Pain is not measured only at the sore place. Your brain can turn the signal up when you are frightened, or down when you are busy, safe, or distracted. Rubbing a bump helps because touch messages can jostle with pain messages on the way in.
Tap your elbow gently, then rub it, and ask which feeling gets more attention.
Watercolour scenes, straight answers, about three minutes cover to cover.
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