Common symptoms of dehydration can manifest in several ways, including thirst, dry mouth, fatigue, dizziness, and lightheadedness. More severe symptoms may include confusion, decreased urine output, and dark yellow urine, indicating the body is not receiving adequate fluid. Headaches and muscle cramps can also occur as the body struggles to function properly under dehydrated conditions. In extreme cases, dehydration can lead to serious complications like kidney stones or urinary tract infections. Recognizing these symptoms early on is crucial for maintaining hydration and overall health, especially during hot weather or intense physical activity.