A rapid heartbeat does not indicate whether a thyroid nodule is getting bigger or smaller. A rapid heartbeat can be caused by physiological factors or by disease factors such as hyperthyroidism. Thyroid nodule enlargement or shrinkage usually do not have obvious symptoms, if too much enlargement may appear breathing difficulties, swallowing difficulties and other pressure symptoms, but usually do not appear the symptoms of rapid heartbeat, so the rapid heartbeat can not indicate that the thyroid nodule has become larger or smaller. Rapid heartbeat can be seen in physiological state, such as nervousness, exercise, etc. In addition, patients with thyroid nodules with rapid heartbeat also need to consider hyperthyroidism, hyperthyroidism will increase the thyroid hormone in the blood circulation, which will lead to high metabolism, resulting in rapid heartbeat. Patients with thyroid nodules who have a rapid heartbeat are advised to go to the hospital after eliminating physiological factors.