Agitation, restlessness, irritability
Decreased attention
Inappropriate or hostile behaviors
Hallucinations, delusions, paranoia
+/- additional features of underlying pathology (e.g. signs of intoxication/withdrawal, trauma)
Acute psychosis
Hypoxic encephalopathy
Excited delirium
Acute toxic-metabolic encephalopathy 
Depression
Hypoglycemia
Schizoaffective disorder
Hyperosmolar state 