[Pain of autonomic nervous system origin].

Reflex sympathetic dystrophy (algodystrophy) is a descriptive term used to designate a clinical phenomenology, which appears after a trauma, often a minor one; it is thought that the sympathetic nervous system plays an important role in its physiopathology. The same applies to sympathetic maintained pain appearing after a lesion of a peripheral nerve (causalgia). There is no agreement as to which are the criteria necessary to make the diagnosis and as to what is the physiopathology of these syndromes. Research in this field is very active today.