People with slow heartbeat may not have any uncomfortable symptoms and have no disease significance, or it may cause palpitations, angina, dizziness, darkness, and other symptoms, and in serious cases, it may even lead to sudden death. Normal physiological slow heart rate has no symptoms, does not affect life, and has no disease significance, such as healthy young people, athletes, etc.. Pathological slow heart rate includes sinus arrest, sinus block, sick sinus node syndrome, severe atrioventricular block and so on. The above causes may lead to insufficient blood supply to the cardiovascular and cerebral vessels, causing palpitations, angina pectoris, dizziness, blackouts and other symptoms of severe cases and even sudden death. The principle of treatment is as follows: if the patient is asymptomatic, no treatment is needed and regular observation is required; if there are obvious symptoms, such as dizziness, palpitation, angina pectoris, loss of consciousness or fainting, shock and other manifestations, a pacemaker should be installed at an early stage for treatment. It is recommended to consult the hospital when slow heart rate is found, to clarify the cause, and to treat it under the guidance and advice of the doctor.