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Symptoms and Signs. Increased levels of thyroxine released from the thyroid gland stimulate the heart to beat more quickly and more strongly. Initially this may produce a fast heart rate which is called a tachycardia. This is observed by a nurse or physician but is usually not noticed by the patient. However, if the fast heart rate becomes severe then palpitations may be observed by the patient. This is an awareness of the heart beating within the chest. Occasionally it can be noticed by normal individuals and may be caused by excessive exercise or drinking too much caffeine.
There is a wide range of what is considered normal for a heart rate. In most cases, the heart rate falls between 60 to 100 beats per minute. Highly conditioned athletes can drop as low as 40, and some people can have heart rates over 100 even in the absence of disease. fast heart rate and palpitations may signal an underlying medical condition. The heart muscle needs to beat a certain number of times each minute in order to deliver the blood and oxygen the body needs to function.