What is headache ? what is cause ?
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Explanation:
Headache pain results from signals interacting among the brain, blood vessels and surrounding nerves. During a headache, an unknown mechanism activates specific nerves that affect muscles and blood vessels. These nerves send pain signals to the brain.
Headaches can have causes that aren't due to underlying disease. Examples include lack of sleep, an incorrect eyeglass prescription, stress, loud noise exposure or tight head wear.
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