The most common cause of acute exacerbation of chronic pulmonary heart disease is infection, because in the winter and spring seasons and sudden changes in the climate, when the patient’s immunity is low resistance is poor, it will trigger an acute attack, which is the main cause. Patients with pulmonary heart disease often have chronic bronchitis, emphysema, etc. With the development of the disease, pulmonary hypertension is formed, which will gradually develop into chronic pulmonary heart disease. This patient’s lung function and structure have changed, and there will be repeated airway infections and lack of oxygen, so that the resistance of the pulmonary circulation also increases, so the pressure of the right ventricle will also increase, and finally there will be symptoms of heart failure.