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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.
Causes of Slow heart rate that are very common. Causes of Slow heart rate that are common. Causes of Slow heart rate that are uncommon. Causes of Slow heart rate that are very rare. Causes of Slow heart rate without any prevalence information. The following causes of Slow heart rate are ones for which we do not have any prevalence information. All Causes of Slow heart rate. Drug side effect causes of Slow heart rate. The following drugs, medications, substances or toxins may possibly cause Slow heart rate as a side effect.