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I believe, Trigeminal Neuralgia is the worst pain one can expierience because many who have this disease have committed suicide because of its unbearable pain, while the knee, with surgery and time can heal, and child birth, with drugs, and stitches can heal, and women volunteer to do it multiple times.
http://en.wikipedia.org/wiki/Anterior_cruciate_ligament
http://en.wikipedia.org/wiki/Childbirth
http://en.wikipedia.org/wiki/Trigeminal_neuralgia