why do i feel lightheaded?

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www.health.harvard.edu › diseases-and-conditionsLightheaded? Top 5 reasons you might feel woozy - Harvard Health www.health.harvard.edu › diseases-and-conditions CachedLocation 4 Blackfan Circle 4th Floor Boston 02115 MAEmail [email protected] (877) 649-9457What causes lightheadedness? Following are the top causes of lightheadedness and common fixes. Dehydration. You may become dehydrated if youre overheated if you arent eating or drinking enough or if youre sick. Without enough fluids the volume of your blood goes down lowering your blood pressure and keeping your brain from getting enough blood causing lightheadedness. Drug side effects. Sometimes medications make you feel lightheaded especially those that lower your blood pressure or make you urinate more. If they work too well theyll lower your blood pressure too much and make you lightheaded. Sudden drop in blood pressure. The autonomic nervous system helps the body regulate the shift in blood pressure when we stand up. As we get older this system may deteriorate causing a temporary drop in blood pressure when we stand—known as orthostatic hypotension—resulting in lightheadedness.