Lightheadedness is a feeling of wooziness or faintness. It is commonly caused by dehydration, drug side effects, blood pressure drops, low blood sugar, heart disease, or stroke. It may help to have a drink of water or orange juice and then lie down. If symptoms are brief, one should report them to a doctor, because lightheadedness may recur due to an undiagnosed underlying problem. Symptoms that last more than 15 minutes call for emergency medical help. Lightheadedness is not the same as dizziness, which refers to feeling like the surroundings are spinning.
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