For example, I cut my arm and I immediately feel pain. Pain is there to notify me that something is wrong or that I’m injured, but now that I’m aware and that I’ve taken care of it (say poured some disinfecant and wrapped it up) why do I still feel that pain. Why can’t our brain know that the wound is not dangerous anymore?
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People who were less aware of pain would have a higher chance of dying, since they were less aware of injuries.
People who were more aware of pain would have a higher chance of living long enough to have children, because they would be more conscious of injuries and would therefore be more careful and/or seek aid.
Therefore, we are all the descendants of the people who paid attention to pain – so we are highly attentive to pain signals.
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