Is headache a disease process?

Some headache's are a "disease process" or should a say symptom of a disease. Some of the diseases that acquire the headache process or symptom are "cold, fever or even some crucial or devastating diseases like bleeding in the brain". So if ever your head hurts or should we call it a headache is to make sure to remember what your activities were in the day or the past day should we say that you have accidentally have bumped your head on some thing or you have been showering in the rain for too long that you have cought a cold or even you have been staying in the sun for too long without any cap or things that protect your head from the heat of the sun. Hope i have helped in your question.