| A headache is a symptom of an underlying disorder in the body and is not a disease in itself. There are several factors that contribute to the development of headaches and these include stress, dehydration, low blood sugar after missing meals, infections, high blood pressure, eye strain, brain aneurysms, brain tumors, sinusitis, head injury, and even premenstrual syndrome.
Most causes of the headaches are self-limiting, that is, they subside by themselves after a while or on removal of the causative factor. Those that do not resolve in this manner require further investigation and medical intervention.
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