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Apart from the unpleasantness and inconvenience, dizzy spells catch people off guard and can result in fractures. The causes of dizziness, according to Geriatrics (37#4:117), may involve almost any part of the body, including especially the ear, nerves, brain, heart, and circulatory system. Some are difficult to detect because they occur only during dizzy spells and at other times leave no trace.
For example, one of the most common causes of dizziness is an abnormal heart rhythm that lasts for just a few seconds. During that time, the heart pumps so inefficiently that it fails to deliver an adequate blood supply to the brain. To detect such transient and occasional arrhythmias, the patient may need to wear a Holter Monitor (a tiny, portable electrocardiograph machine) for days on end while going about life normally at home. Most such heart rhythm disturbances, when detected and studied, can be controlled with medication.
Other causes of dizzy spells range from the very simple (hard wax, a hair, or some other "foreign body" touching the ear drum) to the rather complex (the low blood sugar that can occur following meals in "pre-diabetes").
Dizziness that keeps occurring without apparent cause often makes people fearful and depressed, and one must not give up too quickly in searching for the cause.