Drug, chemical or alcohol related:
(1) alcohol or drug withdrawal
(2) adverse drug reaction
(3) drug-drug interaction
(4) toxic encephalopathy
Metabolic problem:
(1) electrolyte abnormalities
(2) metabolic encephalopathy (including hepatic encephalopathy)
(3) hypoglycemia
Neurologic disorder:
(1) dementia
(2) pre-existing psychosis
(3) intracerebral vascular accident or hemorrhage (stroke, subdural hematoma, subarachnoid hemorrhage)
(4) infectious encephalopathy (encephalitis, other)
(5) post-ictal
Acute disease:
(1) sepsis
(2) hypoxia
(3) pain untreated or inadequately treated
