Common side effects of dehydration include fatigue, dizziness, and headaches. When the body lacks adequate fluids, it can lead to decreased physical performance and cognitive function. Additionally, dehydration can cause dry skin, increased thirst, and reduced urine output. Severe dehydration poses significant risks such as heat-related illnesses and kidney problems. Maintaining proper hydration through regular water intake is crucial, especially during physical activity or in hot climates. Awareness of the signs of dehydration and prioritizing fluid consumption can mitigate the adverse health effects associated with this condition.