It’s something nearly every mammal shares with us, if you notice all the mammals that have similar responses are all pack-oriented. It’s ingrained reactions meant to tell the larger group either “Help me” ie: ‘ow’ ‘tsss’ etc. Or “Run!” ie: ‘AHHH!’ ‘FUHHH’ ‘OOO.’ It’s all dependent on the level of pain, we give an equal level of severity of an alarm. It also for some reason alleviates pain as well.
Source: https://www.jpain.org/article/S1526-5900%2815%2900032-2/abstract
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