The two more serious diseases commonly associated with left chest congestion are pulmonary embolism and coronary heart disease. Pulmonary embolism can lead to increased pressure in the pulmonary artery, followed by increased load on the right heart, which can lead to right heart failure, manifesting as stuffy discomfort in the precordial region, sometimes chest pain and hemoptysis, etc. Coronary heart disease is commonly caused by coronary atherosclerosis, which leads to narrowing of blood vessels, followed by insufficient blood supply to the heart, angina pectoris, and in severe cases, myocardial infarction. Both of these conditions are very serious and require prompt medical attention to improve electrocardiogram, cardiac ultrasound, D-dimer and other examinations to avoid delays. Treatment for pulmonary embolism is mainly based on anticoagulation, reducing pulmonary artery pressure and heart load; treatment for coronary artery disease can take drugs to improve circulation and expand the crown, and implant stents if necessary.