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The sensory aspects of pain are what people normally refer to when they talk of pain, namely that it is a personal, private sensation that is experienced as unpleasant or highly noxious to the person experiencing it. When someone says “I am in pain”, or “It hurts”, it is often this sensory element that is referred to. This sensation is interpreted cognitively as reflecting harm to the person, who also responds, possibly simultaneously with emotional/ motivational activation and some patterns of behavioural response.

The purpose of this seems to be to signal damage and protect from further harm.