Headache
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Headache is defined as "the symptom of pain in the cranial region. It may be an isolated benign occurrence or manifestation of a wide variety of headache disorders."[1]
Classification
Primary headaches
Primary headaches are defined as "conditions in which the primary symptom is headache and the headache cannot be attributed to any known causes."[1]
Migraine headache
Tension headache
Secondary headache
Secondary headaches are defined as "conditions with headache symptom that can be attributed to a variety of causes including brain vascular disorders; wounds and injuries; infection; drug use or its withdrawal."[1]