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First time I have heard that as pain classification in an article.
That’s just a quote from the woman speaking about her experience. I’ve personally heard often about childbirth as potentially causing incredibly intense pain.
Pain during childbirth is claimed by the Bible to be a literal curse from God in Genesis 3:16, so, yeah, I’d reckon that it’d be hard to top that!
I’m a dentist. I hear it all the time. Its a good comparison for, often, the worst pain someone has experienced.