Lightheadedness

Lightheadedness is a common and often unpleasant sensation of dizzinessand/or feeling that one may be about to faint, which may be transient, recurrent, or occasionally chronic. In some cases the individual may feel as though her or his head were weightless. It can be simply an indication of a temporary shortage of bloodor oxygento the brain, low blood pressure, low blood sugar, or anemia. It can also be a symptom of many other conditions, some of them serious, such as heart disease, stroke, or bleeding.

Treatment for light-headedness can include drinking plenty of water or other fluids, eating something sugary, and lying down or sitting and reducing the elevation of the head relative to the body (for example by positioning the head between the knees).

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It uses material from the http://en.wikipedia.org/wiki/Lightheadedness Wikipedia article Lightheadedness.