A common symptom of dehydration is thirst, which acts as the body's signal that it requires more fluids. Dehydration occurs when the body loses more fluids than it takes in, leading to an imbalance that can affect various bodily functions. Alongside thirst, other noticeable symptoms include dry mouth, fatigue, dizziness, and decreased urine output, which can indicate varying degrees of dehydration. Severe dehydration can result in more serious symptoms, such as rapid heartbeat, confusion, and fainting. It is essential to address dehydration promptly by increasing water intake and, if necessary, seeking medical attention to prevent complications.