The gate control theory of pain. There is a gate that allows pain molecules to enter your brain from your nerves. But only so much can get through at one time. When you touch a painful area, some of the touch molecules squeeze through the gate, reducing how many pain molecules can fit through the same gate at the same time. Touch alleviates pain (think of rubbing a sore muscle).
Whenever there’s an emergency(injury), firefighters (blood) are dispatched to contain the damage and head relief efforts as are police and paramedics. However, when they’re dispatched to a narrow, two lane road(capillaries), there’s a traffic jam. When you apply pressure and rub the effected area, it’s like you’re helping the emergency services move better and more organized, fixing the traffic jam.
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