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Pain tolerance is the maximum level of pain that a person is able to tolerate. Pain tolerance is distinct from pain threshold. The perception of pain that goes in to pain tolerance has two major components. First is the biological component—the headache or skin prickling that activates pain receptors. Second is the brain’s perception of pain—how much focus is spent paying attention to or ignoring the pain. The brain’s perception of pain is a response to signals from pain receptors that sensed the pain in the first place.
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