Acute Confusional State (ACS): Definition, Symptoms & Causes

The term "acute confusional state" or "acute confusional syndrome" refers to an acute condition of confusion, disorientation, disordered thinking and memory, agitation, hallucinations, and other cognitive and behavioral disturbances. It is often caused by a sudden change in the brain's function, such as delirium, and can be a symptom of various medical conditions, such as infections, medication side effects, electrolyte imbalances, or drug or alcohol withdrawal.