Hypovolemia
Hemorrhage (trauma, GI bleeding)
Vomiting, diarrhea
Drugs: e.g. antihypertensives
Vessels
Cardiomyopathy
Hypertrophic cardiomyopathy
Myocardial infarction
Cardiac tamponade
Atrial myxoma
Anaphylaxis
Pulmonary embolus
Ruptured aneurysm
Aortic stenosis
Arrhythmias
Pneumothorax
Third-spacing
Peritonitis
Sepsis
Pancreatitis
Endocrine
Hypothyroidism
Addison’s disease/Adrenal insufficiency
