There is more to pain than just injury
Many people think that pain is the result of injury or damage to tissue. The reason for that is that pain warns us whenever we're experiencing tissue damage or are about to.
But there is more to pain. Our perception of pain is constructed from sensory information and context - our circumstance, needs, motivations, who we're with, and our expectations. This means that pain is more malleable and manageable than we think.
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