Which of the following is a common symptom of dehydration?

Thirst, dry mouth, fatigue, and dizziness are indeed common symptoms of dehydration. When the body loses more fluids than it takes in, it struggles to maintain optimal hydration levels, leading to these noticeable signs. Thirst is the body's primary mechanism to signal the need for fluid intake; as dehydration progresses, dry mouth or a parched feeling occurs due to decreased saliva production. Additionally, the overall lack of fluids can result in fatigue because the body needs water for various physiological functions, including energy production. Dizziness often manifests when dehydration leads to reduced blood volume, affecting blood pressure and, consequently, the brain's oxygen supply. Understanding these symptoms is crucial for identifying dehydration early and taking appropriate steps to rehydrate securely.