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Some of the less common causes of Slow heart rate may include: Escape rhythms. Arrhythmias. Central vestibular disorders. Head trauma. Migraine. Multiple sclerosis. Orthostatic hypotension.
Your doctor can determine whether or not your heart rate is abnormally fast or slow, since the significance of an abnormal heart rate depends on the situation. For example, a teen or adult with a slow heart rate might begin to show symptoms when the heart rate drops below 50 beats per minute. However, keep in mind that trained athletes have a lower resting heart rate â so a slow heart rate in these people isn't considered abnormal if no symptoms are associated with it.