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Headache, or cephalgia, is literally an ache in the head. Headaches are a common complaint, and are usually a symptom of other problems – ranging from fatigue, stress, eyestrain, sleep deprivation, alcohol consumption, dehydration, and infections, to tumors in the brain. Persistent headaches need to be investigated by a doctor.Join our online group on headaches. Ask your questions to experts and share your experiences.