Many of the signs and symptoms patients experience when they are diagnosed with hyperthyroidism result from the direct effect of thyroid hormones on the heart. While heart effects are also seen in hypothyroidism, they are usually much more obvious in hyperthyroidism.Excess thyroid hormone causes palpitations and some degree of exercise intolerance that is due to an increased heart rate and fatigue. The changes in heart rate are a result of a change in the nervous system's control on the heart. With excess thyroid hormones in the body, a heart rate of greater than 90 beats per minute (tachycardia) is common, even at rest and when asleep. In addition, the normal increase in heart rate during exercise is exaggerated. A rapid heart rate is one of the most common signs of hyperthyroidism.If you have the Symptoms of Hyperthyroidism--Heart palpitations, we would say herbal medicine is a safe and effective form of treatment. At TCM Window, we offer relaxing treatments and expert guidance through the whole process. We specialize in different kinds of chronic and difficult miscellaneous diseases, we offer the best possible care in a peaceful and welcoming environment. If you would want our expert to create a TCM diagnosis, please fill out the health form as requested.