User blog comment:Jake888/Why I Think We Like to Shit our Pants./@comment-25947144-20170203203127/@comment-25947144-20170203235241

Well, as I said, I still think that (indirectly) relates to death. You may be consciously not afraid of death, but pain is a signal of damage to your tissues. That means that there if the pain source isn't stopped, a danger of severe injury, which can easily lead to death.

As for the emotional pain, I think it's because it can lead to mental breakdown or mental illness (having one is one of my worst fears, by the way) which is practically the death of you. Your conscious. Your personality. You.