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Headache:

Pain in the cranial region that may occur as an isolated and benign symptom or as a manifestation of a wide variety of conditions including SUBARACHNOID HEMORRHAGE; CRANIOCEREBRAL TRAUMA; CENTRAL NERVOUS SYSTEM INFECTIONS; INTRACRANIAL HYPERTENSION; and other disorders. In general, recurrent headaches that are not associated with a primary disease process are referred to as HEADACHE DISORDERS (e.g., MIGRAINE).

Synonym: vertex headache, unilateral headache, thunderclap headache, throbbing headache, stabbing headache, sharp headache, retro-ocular headache, post-lumbar puncture headache, post-dural puncture headache, periorbital headache, orthostatic headache, ocular headache, head pain, generalized headache, cranial pain, cough headache, cephalodynia, cephalgia, cephalalgia, bilateral headache, postdural puncture headache.