What causes headaches?

Headaches can result from multiple factors, including tension in neck and scalp muscles, dehydration, eye strain, or sinus pressure. Migraines, a severe form, are linked to changes in brain chemistry and blood flow. Environmental triggers such as bright lights, strong odors, or certain foods may worsen them. Stress, poor posture, lack of sleep, and skipping meals also contribute. Some headaches are secondary symptoms of underlying conditions like high blood pressure or infection. Managing stress, staying hydrated, and maintaining regular sleep help reduce frequency. Persistent or severe headaches should be medically evaluated.