Many possibilities: Many possible causes. Your doctor will evaluate for abnormal heart rhythm (fast or slow), artery blockages in the neck, low or very high blood pressure, or very weak heart muscle. Simple, painless tests such as an electrocardiogram, echocardiogram, and carotid ultrasound may be appropriate. Blood tests will evaulate the for diabetes, anemia, and abnormalities of the thyroid, liver, kidneys, .
Answered 10/3/2016
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