A hit to the head may cause sometimes a subdural hematoma which is accumulation of blood clot above the brain and below the skull bone. this may cause headache. Imaging ( MRI or CT scan) is the way to diagnose it. Anyway, if your headache is relatively new in onset and quite bad, better do imaging.
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It is recommended that all individuals see a Family Doctor for a full medical examination annually. Adults should get their blood pressure checked (US Preventive Task Force), a flu vaccine (CDC) and more each year.