Final answer:
The correct answer is that 'over-hydration' is not typically a cause of delirium. While delirium can be caused by various factors such as infections and dehydration, over-hydration can lead to a different set of health issues such as electrolyte imbalances rather than delirium.
Step-by-step explanation:
The causes of delirium include a variety of factors such as medical conditions, physiological changes, and environmental influences. Specifically, conditions like urinary or respiratory infections, urinary/fecal retention, and states like dehydration can contribute to delirium. Dehydration itself can result from numerous factors, including blood loss, diarrhea, cardiogenic shock, kidney disease, and excessive water loss through skin evaporation and air from the lungs, excessive sweating, vomiting, and fever.
However, over-hydration, or excessive water intake, is generally not a cause of delirium; rather, it can lead to conditions such as hyponatremia. Over-hydration may be seen in scenarios such as excessive water intake or conditions like kidney disease, but it is more typically associated with altered electrolyte balance rather than delirium, which is more often linked to dehydration and its complications.
Therefore, the option stating 'lack of drugs' as a cause of delirium is also not typically accurate unless referring to withdrawal from certain substances that the body has become dependent on. It's the sudden lack of these substances that may contribute to delirium, not the lack of drugs more generally.