| http://www.w3.org/ns/prov#value | - Headache is the most common reported symptom, with dizziness the second most common.6,25,29,30 Loss of consciousness only occurs in about 10% of concussions.5,6,30???34 Several symptoms of concussion are nonspecific, eg, nausea, vomiting, and headache are a common presentation of acute gastroenteritis, and dizziness is a common symptom of acute cardiac compromise.
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