The role of hydration in preventing headaches is often underestimated. Dehydration can reduce blood volume, limiting oxygen flow to the brain and triggering pain. Drinking adequate water throughout the day helps maintain electrolyte balance and supports optimal brain function. People who experience frequent headaches should monitor fluid intake, especially during heat or exercise. While medications like nitazoxanide 500mg are used for infections, they do not replace proper hydration for headache prevention. Simple habits such as carrying a water bottle and consuming water-rich foods can significantly reduce headache frequency and improve overall well-being. Staying hydrated is a simple, effective preventive strategy.