You're not alone if you've ever felt a throbbing headache after spending time in the sun or a hot room. Heat can trigger headaches in many people, often due to dehydration, prolonged sun exposure, or overheating. As your body loses fluids through sweat, essential electrolytes drop, leading to symptoms like dizziness, fatigue, and pain in the head or neck. Understanding the link between heat, dehydration, and headaches is the first step toward prevention ...