What's the worst pain you've ever experienced?

Because of a semi-herniated disc, my back seizes up every couple years or more. It gets a lot worse if I run for exercise. A number of years ago I went on a week-long hitchhiking trip with a friend, carrying camping gear. After a week of walking, sitting in cars, and sleeping on the ground I was good and sore. Not long after I got home my back seized up and I was nearly immobile for a week. The only comfortable position was on my back with my knees elevated a bit, but getting into and out of that position was excruciating. The pain was both general and specific. When my back's not seized I can't actually recall what the pain was like, so it's more or less impossible to describe as well. Perhaps the most descriptive word would be 'all-consuming'.

/r/AskReddit Thread