Lightheadedness when standing up is most often caused by an excessive drop in blood pressure as blood pools in your legs and not enough reaches the brain. Called orthostatic hypotension, it affects 10 to 30 percent of older adults. Normally, your body can boost heart rate and tighten blood vessels to compensate. But aging, dehydration, and blood pressure medications can interfere. Tell your doctor, stay hydrated, exercise, and always et up slowly. Be especially cautious when waking, after eating, when it’s hot out, or after taking a hot bath or shower, digestion and heat can make it worse.
Source: Consumer Reports on Health September 2018
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