| http://www.w3.org/ns/prov#value | - You have a headache that is the ?????????????worst headache of your life; Your headaches increase in frequency or severity; You are experiencing headaches four or more times a month; You miss school, work or social activities because of headache; You have such symptoms as changes in vision or hearing, numbness, tingling or weakness in the face or extremities, blurred speech, or dizziness.
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