Sinus bradycardia may be related to frequent running, which is caused by physiological reasons, but it can also be triggered by pathological reasons, such as intracranial diseases and hypothyroidism. Frequent runners, especially healthy young people, athletes, etc., due to long-term exercise, the heart pumping capacity gradually increased, the heart reserve function is stronger, the frequency of sinus rhythm can be slowed down, less than 60 beats / minute, if not accompanied by dizziness, dizziness, and other cardiac output performance, no obvious symptoms, generally do not need to be treated. However, bradycardia can also be caused by other reasons, such as intracranial disease, severe hypoxia, hypothermia, obstructive jaundice, hypothyroidism, sinus node lesions, acute lower wall myocardial infarction, and drug effects. If sinus bradycardia is present, it is recommended to go to the hospital for a thorough examination, and if it is due to a pathologic cause, it should be actively treated for the primary disease.