How bad?: A headache that does not go away with a normal dose of paracetamol (acetaminophen) needs to be checked out right away. Brain injuries, including concussion can be serious. So if your headache is bad, or not relieved by normal doses of over the counter meds, or you have vomiting, dizziness, numbness, tingling, etc., you need to get checked immediately at an ER, even if a month after injury.
Answered 5/22/2015
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