What are the signs of dehydration?

The signs of dehydration primarily include dry mouth, increased thirst, fatigue, and dark-colored urine. These symptoms are indications that the body lacks sufficient fluids to function properly. A dry mouth occurs when there is not enough saliva, which often follows the sensation of thirst, signaling the need for hydration. Fatigue can result from the body's lack of fluids, affecting energy levels and overall health. Dark urine is a key indicator of dehydration; as the body conserves water, urine becomes more concentrated, leading to a darker color, which indicates insufficient hydration.

While increased appetite and clear urine, swelling and frequent urination, and excessive sweating and headaches can relate to other health issues, they are not characteristic signs of dehydration. Increased appetite does not typically occur with dehydration, and clear urine generally signifies good hydration, contrasting with the dark urine associated with dehydration.