Hypothyroidism will affect the heart, hypothyroidism will cause hypothyroidism heart disease, patients with hypothyroidism when the synthesis of thyroxine is insufficient, the basal metabolic rate will be reduced to cause lipid metabolism disorders, resulting in elevated blood cholesterol, and hypercholesterolemia is a risk factor for patients with coronary heart disease. Hypothyroidism is a risk factor for coronary heart disease. When the basal metabolic rate of the body decreases, the energy consumption of the tissues decreases, and the rhythm of the heart is affected, which can easily lead to bradycardia, conduction block, and so on. When the metabolic rate of hypothyroidism decreases, the slowing down of body functions will cause water and sodium retention, which will lead to local tissue edema, and also cause mucous edema, and mucopolysaccharides and mucin accumulation in the tissues, myocardial swelling, and leakage of tissue fluids leading to pericardial effusion. Therefore, suffer from hypothyroidism should be actively diagnosed and treated, and at the same time improve the relevant examination, if there is any abnormality in the examination should be actively symptomatic treatment.