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MedlinePlus: Concussion
Fact sheet about concussions, brain injuries "that may result in a bad headache or unconsciousness." Covers causes, symptoms, exams and tests, treatment, possible complications (such as an intracerebral hemorrhage), prevention, and when to contact a medical professional. From the National Library of Medicine (NLM) and National Institutes of Health (NIH).
http://www.nlm.nih.gov/medlineplus/ency/article/000799.htm
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