autonomic nervous system disorder dysautonomia An acute or chronic disorder, affecting the sympathetic or parasympathetic nervous system. It can be primary, the result of central nervous system degeneration, or secondary due to diabetes or alcoholism. Patients with the chronic form of this disorder usually have a progressive clinical course and a poor prognosis. MEDGEN:8511 dysautonomia MONDO:0044872 UMLS:C0013363 NCIT:C53439