A disorder characterized by CONFUSION; inattentiveness; disorientation; ILLUSIONS; HALLUCINATIONS; agitation; and in some instances autonomic nervous system overactivity. It may result from toxic/metabolic conditions or structural brain lesions. (From Adams et al., Principles of Neurology, 6th ed, pp411-2)

A mental state in which a person is confused, disoriented, and not able to think or remember clearly. The person may also be agitated and have hallucinations, and extreme excitement.

A mental state, characterized by fluctuations in orientation, concentration and ability to think clearly.

A state of sudden and severe confusion.

A usually reversible condition characterized by the acute and sudden development of confusion, illusions, movement changes, inattentiveness, agitation, and hallucinations. Causes include drug abuse, poisoning, infectious processes, and fluid and electrolyte imbalance.

Acute reversible mental disorder characterized by confusion and some impairment of consciousness; generally associated with emotional lability, hallucinations or illusions and inappropriate, impulsive, irrational or violent behavior.

Disorder characterized by confusion, inattentiveness, disorientation, illusions, hallucinations, agitation and in some instances autonomic nervous system overactivity; may result from toxic or metabolic conditions or structural brain lesions; condition may also be acute and reversible.

Sudden, severe confusion that occurs because of a mental or physical illness.

Delirium is a mental state in which you are confused, disoriented, and not able to think or remember clearly. It usually starts suddenly. It is often temporary and treatable. There are three types of delirium: Hypoactive, when you are not active and seem sleepy, tired, or depressed; Hyperactive, when you are restless or agitated; Mixed, when you change back and forth between being hypoactive and hyperactive. There are many different problems that can cause delirium. Some of the more common causes include: Advanced cancer.; Alcohol or drugs, either from intoxication or withdrawal. This includes a serious type of alcohol withdrawal syndrome called delirium tremens. It usually happens to people who stop drinking after years of alcohol use disorder (AUD).; Dehydration and electrolyte imbalances.; Dementia.; Hospitalization, especially in intensive care.; Infections, such as urinary tract infections, pneumonia, and the flu.; Medicines. This could be a side effect of a medicine, such as sedatives or opioids. Or it could be from withdrawal after stopping a medicine.; Metabolic disorders.; Organ failure, such as kidney or liver failure.; Poisoning.; Serious illnesses.; Severe pain.; Sleep deprivation.; Surgeries, including reactions to anesthesia. Certain factors put you at risk for delirium, including: Being in a hospital or nursing home; Having dementia; Having a serious illness or more than one illness; Having an infection; Older age; Having surgery; Taking medicines that affect the mind or behavior; Taking high doses of pain medicines, such as opioids. The symptoms of delirium usually start suddenly, over a few hours or a few days. They often come and go. The most common symptoms include: Changes in alertness (usually more alert in the morning, less at night); Changing levels of consciousness; Confusion; Disorganized thinking, talking in a way that doesn't make sense; Disrupted sleep patterns, sleepiness; Emotional changes: anger, agitation, depression, irritability, overexcitement; Hallucinations and delusions; Memory problems, especially with short-term memory; Trouble concentrating. Your health care provider may use many tools to make a diagnosis: A medical history, which includes asking about your symptoms; Physical and neurological exams; Mental status testing, which checks for problems with your thinking and alertness; Lab and diagnostic imaging tests. Delirium and dementia have similar symptoms, so it can be hard to tell them apart. You can also have both at the same time. The differences between them are that: Delirium starts suddenly and can cause hallucinations. It is mainly a problem with attention and staying alert. The symptoms may get better or worse and can last for hours or weeks.; Dementia develops slowly and does not cause hallucinations. It usually starts with memory loss. The symptoms don't change often, like they can with delirium. Dementia almost never gets better. Treatment of delirium...

A disorder characterized by the acute and sudden development of confusion, illusions, movement changes, inattentiveness, agitation, and hallucinations. Usually, it is a reversible condition.

Delirium is an acute, transient, usually reversible, fluctuating disturbance in attention, cognition, and consciousness level. Causes include almost any disorder or drug. Diagnosis is clinical, with laboratory and usually imaging tests to identify the cause. Treatment is correction of the cause and supportive measures.

Delirium is defined as a transient, usually reversible, cause of cerebral dysfunction and manifests clinically with a wide range of neuropsychiatric abnormalities. It can occur at any age, but it occurs more commonly in patients who are elderly and have compromised mental status.

Delirium is a serious disturbance in mental abilities that results in confused thinking and reduced awareness of the environment. The start of delirium is usually rapid - within hours or a few days.

Delirium, a mental disturbance marked by disorientation and confused thinking in which the patient incorrectly comprehends his surroundings. The delirious person is drowsy, restless, and fearful of imaginary disasters. He may suffer from hallucinations, seeing terrifying imaginary animals or...