Autonomic Insufficiency Syndrome (Dysautonomia)

Etiology

Autoimmune disorders, especially Lyme disease[5] and Type I diabetes
Bad body posture (causes compression of important arteries and/or nerves) [xxx]
Brain injury
Degenerative neurological diseases such as Parkinson’s disease
Exposure to chemicals (e.g., most commonly, pyridoxine)
Genetic factors
Hereditary connective tissue diseases, especially Ehlers-Danlos Syndrome
Pregnancy
Physical trauma or injury which damages the autonomic nervous system, as with Cerebral salt-wasting syndrome.
Viral illness
Mitochondrial Diseases

Excessive fatigue
Excessive thirst (polydipsia)
Lightheadedness, dizziness or vertigo
Feelings of anxiety or panic (not mentally induced)
Rapid heart rate or slow heart rate
Orthostatic hypotension, sometimes resulting in syncope[3] (fainting)
Other symptoms frequently associated with dysautonomia include: headaches, pallor, malaise, facial flushing, salt cravings, constipation, diarrhea, nausea, acid reflux, visual disturbances, orthostatic hypotension, numbness, nerve pain, trouble breathing, chest pains, in some cases loss of consciousness and seizures.
Acute/Chronic Hypoventilation (see Acute Hypoventilation, [[Acute Hypoventilation]] and Chronic Hypoventilation, [[Chronic Hypoventilation]])
A full list of symptoms may be found at the Dysautonomia Information Network