Symptoms of dehydration can range from mild to severe and include thirst, dry mouth, fatigue, and dizziness. As dehydration progresses, individuals may experience headaches, dark yellow urine, confusion, and rapid heart rate, which can signal a serious condition. Athletes or individuals engaging in intense physical activity are particularly susceptible to dehydration, emphasizing the importance of regular fluid intake. Staying hydrated can be managed by drinking water throughout the day and consuming hydrating foods such as fruits and vegetables, especially during hot weather or physical exertion.