Tachycardia is clinically known as tachypnea, which can be examined by routine blood tests, thyroid function tests, electrocardiogram and 24-hour ambulatory electrocardiogram. 1. Blood routine: Elevated white blood cells, neutrophils, and C-antiprotein can be used as a basis for infection, such as pericarditis. After infection, the body’s autoimmune system will respond to the invading pathogenic bacteria, resulting in increased body temperature and tachycardia. 2. Thyroid function test: Thyroid function is a powerful basis for detecting hyperthyroidism. Patients with hyperthyroidism have elevated levels of thyroid hormones, and their body functions are in a state of hyperactivity, such as increased metabolism and sympathetic excitation, which ultimately leads to tachycardia. 3. Electrocardiogram, 24-hour dynamic electrocardiogram: ordinary electrocardiogram can clearly show all kinds of arrhythmia, if you want to get more accurate data, you can do 24-hour dynamic electrocardiogram examination. If the patient has symptoms of tachycardia, he/she should consult a doctor in time. The doctor will judge the specific cause of the disease and draw up a treatment plan according to the examination results after detailed consultation.