Headaches become chronic very easily and requires attention to quality of meals, regular intake of water, any excess
sugar or gas forming foods, your ability to cope with stress and need for rest after mental exertion, your eye health, your blood pressure, any kind of acidity or fullness after meals.
Location of pain will give fair idea about the cause and can easily be treated with homeopathic remedies.
In my experience, frequency of headaches have reduces within one week of start of treatment.