Severe confusion that develops quickly, and often fluctuates in intensity
Delirium (formerly acute confusional state, an ambiguous term which is now discouraged) is a specific state of acute confusion attributable to the direct physiological consequence of a medical condition, effects of a psychoactive substance, or multiple causes, which usually develops over the course of hours to days. As a syndrome, delirium presents with disturbances in attention, awareness, and hi... Wikipedia