The heart is always beating fast, and this condition is considered to be caused by congenital genetic factors, such as the sympathetic nerves are more excited by birth, and the relative heartbeat is faster. In addition, it may also be due to heart failure or cardiomyopathy or congenital heart disease, which can also lead to a faster heartbeat. Some patients are chronically anemic, a condition that can also induce a faster heartbeat. To further clarify the diagnosis, patients are advised to have routine blood tests, thyroid function, serum ions, cardiac ultrasound, and an ambulatory electrocardiogram, which can help assess the overall 24-hour average heart rate. It can also better identify whether the fast heartbeat is induced by ionic disorders, anemia, or hyperthyroidism.