Headaches can happen for many reasons, including stress, lack of sleep, illness, allergies, and migraines. However, one of the most overlooked causes of headaches is dehydration. When the body doesn’t have enough fluids to function properly, it can trigger a variety of symptoms, including head pain that ranges from mild discomfort to a severe, throbbing headache. Dehydration headaches are especially common during summer months, when hot weather, outdoor activities, and excessive sweating increase fluid ...