Delayed encephalopathy due to carbon monoxide intoxication is clinically characterized by a recurrence of neurological or psychiatric symptoms. This recurrence is preceded by a temporary asymptomatic period (lucid interval) that is of variable duration (usually 2-3 weeks) after recovery from the acute stage CO intoxication. The underlying pathological lesion is thought to be diffuse demyelination of the cerebral white matter; however, the mechanism causing the pathogenesis remains unexplained. Here, we report a case of delayed encephalopathy characterized by the patient suffering from two episodes of cognitive dysfunction on Day 2 and Day 33 after carbon monoxide intoxication. Tests were performed during hospitalization that revealed bilateral sciatic neuropathy. The patient can now feed herself and walk with the assistance of a walker.