
Delirium is a serious mental disorder, which can cause two most common type of behaviors, namely, hyperactive behavior, which is characterized by severe confusion, disorientation and disturbance in consciousness that fluctuates and hypoactive behavior, which is characterized by the sudden onset of withdrawal from interaction with the outside world. This serious mental disorder is mainly caused due to physical or mental illnesses, which is temporary and reversible in most of the cases. Major symptoms include clouding of consciousness, disorientation of thoughts, illusions, hallucinations, fluctuating levels of consciousness, dysphasia, dysarthria, tremors, asterixis in hepatic encephalopathy and uremia. Some major factors that cause delirium are withdrawal from alcohol or sedatives, drug abuse, chemical disturbances within the body, infections, strokes, dementia, poisoning and surgeries.