What is a common characteristic of delirium?

A common characteristic of delirium is an acute onset and disorientation. Delirium is often characterized by a sudden change in mental status that can occur over hours or days, rather than gradually. This condition is typically marked by confusion, disorientation to time and place, and an inability to focus attention. These symptoms can fluctuate throughout the day, making it important to recognize the acute nature of the changes in behavior and cognition.

In contrast, the other options describe characteristics that do not align with delirium. A gradual onset with memory loss is more indicative of conditions like dementia, which develops over time. Normal consciousness deterioration is not applicable, as individuals experiencing delirium often have fluctuating levels of consciousness. Lastly, long-term irreversible changes are associated with chronic conditions rather than delirium, which is usually temporary and reversible once the underlying issue is addressed. Recognizing these key features of delirium is essential for proper diagnosis and intervention.