complex regional pain syndrome (Monarch Disease Ontology identifier MONDO_0019369) is a chronic pain syndrome characterized by a disproportionate spontaneous or stimulus-induced pain, accompanied by a variably mixed myriad of autonomic and motor disorders including symptoms such as swelling, allodynia, skin blood supply and trophic disturbances. CRPS most often affects one of the arms, legs, hands, or feet and usually occurs after an injury or trauma to that limb. Also known as: CRPS, Complex regional pain syndromes, algoneurodystrophy.