What are common signs of dehydration in a patient?

The signs of dehydration include symptoms that are directly related to a decrease in body fluid levels. Dry mouth, increased thirst, low blood pressure, and decreased urine output are all classic indicators of this condition.

Dry mouth occurs as the body begins to conserve water, leading to less saliva production. Increased thirst is a natural response, as the body signals the need for fluids to restore balance. Low blood pressure results from reduced blood volume, which can affect circulation and overall cardiovascular function. Decreased urine output indicates that the kidneys are conserving as much fluid as possible due to diminished available fluids in the body, further emphasizing the state of dehydration.

Other options present symptoms that do not align with the typical presentation of dehydration. For instance, increased appetite might be contrary to what one would expect in a dehydrated individual, as reduced fluid intake can often diminish hunger. High blood pressure and frequent urination are generally not associated with dehydration, as both may indicate other health imbalances. Fatigue, excessive sweating, and headaches can be symptoms of dehydration but are not as directly indicative as those listed in the correct choice.