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Apart from being either acute or chronic, pain is also describedaccording to its source in the body and the nociceptors, pain-detectingneurons, which can cause 'sympathetic' or referred pain in other areasof the body, or even give a feeling of pain in limbs which have beenamputated
To counter problems of stomach upsets with the NSAIDs, drug companieshave devised two new drug families-the nonacetylated salicylates, andCOX-2 (cyclo-oxygenase-2) inhibitors