Intravascular volume depletion

Blood loss
Dehydration
Pregnancy/postpartum
Shock

Cardiovascular

Anemia
Cardiac arrhythmia
Congestive heart failure
Myocardial infarction
Myocarditis
Pericarditis
Valvular heart disease
Venous insufficiency
Postprandial hypotension

Neurologic Causes

Amyloidosis (hereditary and primary)
Diabetic autonomic neuropathy
Lewy body dementia
Multisystem atrophy (Shy-Drager syndrome)
Parkinson disease
Pure autonomic failure

Drugs

Alcohol
Antiadrenergics
Antianginals
Antiarrhythmics
Anticholinergics
Antidepressants
Antihypertensives
Antiparkinsonian agents
Diuretics
Narcotics
Neuroleptics
Sedatives

Endocrine Causes

Adrenal insufficiency
Diabetes insipidus
Hyperglycemia, acute
Hypoaldosteronism
Hypokalemia
Hypothyroidism
Pheochromocytoma

 

Miscellaneous

AIDS
Anxiety or panic disorder
Eating disorders
Prolonged bed rest

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