Which of the following are signs and symptoms of dehydration?

The signs and symptoms of dehydration typically occur when the body's water balance is disrupted, leading to a deficit in body fluids. Thirst is often the first indication that the body needs hydration. Dry mucous membranes, such as those found in the mouth and nasal passages, are also common, as they indicate a lack of adequate moisture. Decreased urine output is a critical sign, as the body conserves water during dehydration, resulting in less frequent urination. Dizziness can occur due to drops in blood pressure or reduced blood volume associated with dehydration.

The presence of these symptoms together provides clear evidence of dehydration and is consistent with how the body signals its need for fluids. Recognizing these symptoms early is vital for prompt intervention and treatment to restore hydration.