I have experienced pains no more severe than a broken wrist, torn ankle ligaments, or an abscess in a tooth. These were pretty bad, but I have no doubt that a skilled torturer could make me experience pains many times as bad.
Alastair Norcross, ‘Comparing Harms: Headaches and Human Lives’, Philosophy & Public Affairs (Spring, 1997), vol. 26, no. 2, p. 146