disorder of the autonomic nervous system

Provides support, educational material and medical referrals for persons who have dysautonomia (a disorder of the autonomic nervous system).

OI can be a subcategory of dysautonomia, a disorder of the autonomic nervous system occurring when an individual stands up.

Orthostatic intolerance (OI) is a disorder of the autonomic nervous system (a subcategory of dysautonomia) characterized by the onset of symptoms upon standing.