Can mild headache for hours without a reason be migraine, tumor or nothing?

Maybe something else: Go see a hadache s[pecialist for a proper workup. Can be caused by allergies to foods, stress, unlikely a migraine (which is an overused diagnosis).

A new headache: At your age is unlikely to be migraine or cluster, but some say that 'the worst headache of my life' type of head ache is a sign of an aneurysm. That needs urgent attention. However, most headaches are not serious. Can by caused by hunger, constipation, prodrome of viral illnesses. In short, not eady to clarify for you on-line. If not better post 2 tyleonl. Go to er if you are worried.