why does my head hurt

The most common reasons your head might hurt (headache) include muscle tension, stress, lack of sleep, hunger, dehydration, caffeine withdrawal, or exposure to certain triggers like bright lights, strong smells, or weather changes. Primary headaches such as tension headaches and migraines are frequent causes, while secondary headaches may be linked to underlying conditions like sinus infections or medication side effects. Headaches can result from overactivity or irritation of pain-sensitive structures in the head, including muscles, nerves, and blood vessels. Common triggers are stress, fatigue, poor posture, dietary factors, and environmental stimuli. If headaches are severe, frequent, or accompanied by other symptoms, medical advice should be sought to rule out serious causes.