If tachycardia is found during physical examination, it is most likely sinus tachycardia if it is a physiological condition, which is related to the following reasons: first, the patient is weak, the heart reserve function is poor, usually loves to stay up late, does not like to exercise, etc., the patient’s basic heart rate is fast, after a slight activity can cause tachycardia, there is no organic pathological changes, it is also recommended that the patient increase exercise and reasonable rest can be. Secondly, patients with poor psychological quality may have tachycardia rarely at home, but may have transient tachycardia under exogenous stimulation in activities such as physical examinations with many people. Patients are advised to exercise to adjust the nervous mechanism and improve the psychological condition. Third, other tachycardias that may be found during physical examinations may also be pathological and require 24-hour ambulatory ECG, thyroid function tests, etc. to clarify whether the patient has other diseases causing tachycardia.