Relief of slow heart rate caused by hypothyroidism is mainly divided into symptomatic treatment (heart rate raising drugs, artificial pacemaker, etc.) and etiologic treatment (treatment of hypothyroidism). 1. Symptomatic treatment: If the heart rate is too low, there will be the symptom of reduced cardiac output, which can cause angina pectoris, cardiac insufficiency or syncope and other manifestations. If necessary, drugs can be used to increase the heart rate; significant sinus bradycardia with sinus arrest, or frequent syncope, may consider installing an artificial pacemaker. 2. Etiological treatment: to control the level of thyroid hormone in the normal range, so as to improve a series of symptoms brought about by hypothyroidism. The main treatment is to take levothyroxine sodium as an alternative treatment. Hypothyroidism will cause a series of clinical manifestations in the body, therefore, patients need to pay attention to it, seek medical treatment as soon as possible, and carry out treatment under the guidance of the doctor to control the thyroid hormone level within the normal range.