| http://www.w3.org/ns/prov#value | - But in a small percentage of cases, these headaches can be due to a serious underlying condition, such as a hemorrhage, brain aneurysm, stroke, cervical artery dissection or subdural hematoma. ???So we recommend that patients undergo a thorough neurological evaluation to rule out secondary causes, which can be life-threatening,??? Biller said. ???This is especially important when the headache is a
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