Focal brain dysfunction
    vascular events (CVA)
    demyelination
    infection, such as cerebral abcess
    focal head injury
    brain tumour
Diffuse brain dysfunction
    infection, such as meningitis or encephalitis epilepsy
    hypoxia and hypercarbia
    drugs, poisoning and overdoses ( including alcohol)
    metabolic/endocrine causes, such as diabetic coma, hepatic or renal failure, hypothyroidism, severe electrolyte disturbances
    hypotension, or hypertensive crisis
    diffuse head injury
    subarachnoid haemorrhage
    hypothermia, hyperthermia