An unconscious patient

Guillain-Barré syndrome (polyradiculitis)

Multiple sclerosis (MS)

Trigeminal neuralgia and other facial pain

Neuropsychological disorders

Aphasia

Headache

Extra-intestinal protozoal diseases

Ataxia

Fatigue

Haemolytic anaemia

Iron deficiency anaemia

HIV infection

Neurological disorders and alcohol

Macrocytosis (increased MCV)

Carbon monoxide poisoning

Chronic lymphocytic leukaemia (CLL)

Mental disorders due to somatic disease

Listeriosis

Cardiopulmonary resuscitation (CPR)