I'm assuming you are trying to understand someone else's pain scale. That's pretty hard to do like you say, when you have been in pain a lot. This Dr. Pain scale is someone's contrived idea of how pain progresses and yours might not progress the same. Most doctors and hospitals use the 1-10 scale where 10 is the worse pain you've ever felt.
I wouldn't worry about this other scale. You know how to describe it to your doctor and if you use the old 1-10 scale you'll be fine.
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