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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.
For most people, a heart rate of 60 to 100 beats a minute while at rest is considered normal. If your heart beats less than 60 times a minute, it is slower than normal. A slow heart rate can be normal and healthy. Or it could be a sign of a problem with the heart's electrical system. For some people, a slow heart rate does not cause any problems. It can be a sign of being very fit. Healthy young adults and athletes often have heart rates of less than 60 beats a minute. In other people, bradycardia is a sign of a problem with the heart's electrical system.