MONDO_0009131 (Riley-Day syndrome) is a congenital disorder caused by mutations in the IKBKAP gene. It is characterized by damage of the sympathetic and parasympathetic and sensory nervous system. Also known as: Dysautonomia, Familial, HSAN 3, HSAN III, HSAN3, HSN 3, Riley Day syndrome, familial dysautonomia, hereditary sensory and autonomic neuropathy 3.