Pain is an indicator of injury, but not always. Some things like sunburn initially don't hurt. It only starts to hurt when our skin cells begin to die.
A more dramatic example is radiation exposure. It doesn't hurt while a person is exposed because they can only feel what the sensory nervous system can sense. But later on, the radiation poisoning may cause severe damage to the skin and soft tissue.
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Similar ideas to Pain is not the same as 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 info...
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