Dehydration occurs when your body loses more fluids than it takes in, leading to an imbalance that can affect your health. This can happen due to various reasons, such as not drinking enough water, excessive sweating, or illnesses like gastroenteritis. Symptoms of dehydration include thirst, dry mouth, fatigue, and dizziness. To prevent dehydration, it's important to drink plenty of fluids, especially during hot weather or when exercising. Foods with high water content, like fruits and vegetables, can also help keep you hydrated. Remember to listen to your body and drink water regularly to maintain good health.