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Causes of light headedness Light headedness, also known as dizziness, is a symptom and not a disease in itself. Most of the time, it is temporary and mild and has no obvious cause. It could also be a sign of some other problem.
Dizziness usually occurs when there is a lack of blood supply to the brain. It could be caused by a sudden drop in blood pressure, dehydration from vomiting, diarrhoea or fever. With age, this experience can sometimes occur if you suddenly change your posture — for instance, if you suddenly stand up or sit up from a lying down position.
Light headedness is also often a rather scary symptom of a minor illness such as the flu, low blood sugar, an oncoming cold, or seasonal allergies. However, in addition, heart arrhythmias, strokes, brain tumours, and several other serious conditions can also lead to light headedness. These are usually, however, accompanied by other symptoms as well. Vertigo is among the commonest causes of chronic dizziness. It is usually the result of a disorder or infection of the inner ear. Sometimes, it might also indicate a problem with the central nervous system.
As you can see, your friend could have a serious problem, and there are too many possibilities to say what it is for sure. It is best that she visit a doctor.
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