MRI, or magnetic resonance imaging, is not an x-ray, so you do not get exposed to radiation when undergoing MRI. The fact that you have to lie still in a closed tight space surrounded by a very loud noise is what most probably contributed to the headache you had.
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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.