The pathology of<unk>  is not yet completely understood. However, a loss of cells in the intermediolateral column of the spinal cord has been documented, as has a loss of catecholamine uptake and catecholamine fluorescence in sympathetic postganglionic neurons. In general, levels of catecholamines in these patients are very low while lying down, and do not increase much upon standing.
Pure autonomic failure
Ataxia
Primary autonomic failure
Multiple system atrophy
Vasoplegic syndrome
Parkinsonisms
Familial dysautonomia
Postural orthostatic tachycardia syndrome