This is a very non specific complaint as it is a rather common feature to many conditions, most commonly dehydration, decreased blood sugar, a sudden drop in blood pressure (usually upon rising up from a sitting or lying position quickly), to mention a few. More information on this is needed. I advise you to see a physician for a more thorough evaluation.
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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.