Signs and symptoms of dehydration include thirst, dry mouth, fatigue, and decreased urine output. More severe symptoms may involve dizziness, confusion, rapid heartbeat, and dark-colored urine, indicating a more urgent health concern. Maintaining adequate hydration is crucial for overall body function, affecting physical performance, cognitive abilities, and metabolic processes. Preventive measures include regularly consuming water and monitoring fluid intake, especially during intense exercise or hot weather. Recognizing early signs can prevent more serious health implications associated with dehydration.