What is a common sign of dehydration in an elderly patient?

A common sign of dehydration in an elderly patient is dry mucous membranes. In this age group, the body's ability to conserve water and respond to fluid loss diminishes, leading to symptoms that indicate dehydration. Dry mucous membranes occur when there is not enough fluid in the body, causing the tissues lining the mouth and other mucous-producing areas to lose moisture, which can be a clear visual cue for healthcare providers assessing hydration status.

In elderly patients, other signs of dehydration can manifest, such as confusion or decreased mental clarity, but the condition most clearly indicated by the presence of dry mucous membranes is a reliable physical sign of dehydration. Swollen ankles are generally associated with fluid retention, which contradicts a state of dehydration, while increased urine output typically indicates hydration rather than a deficit.