Pulmonary hypertension is a common cardiovascular disease that is so severe if not well controlled that it is known as a cardiovascular cancer. Pulmonary hypertension is caused by pulmonary disease or by increased resistance of the pulmonary circulation due to left heart disease, and can also be caused by chronic thromboembolic disease. When pulmonary hypertension develops severely, it seriously affects the right heart function, leading to enlargement of the right heart and a series of clinical symptoms: first, the most common symptoms are dyspnea, inability to lie down, shortness of breath, chest tightness, and in severe cases, coughing up pink sputum. second, the patient can show signs similar to chest pain, angina pectoris, nausea, vomiting, and in severe cases, gastrointestinal bruising, loss of appetite, vomiting of blood, or even coma. Insufficient blood supply to the brain tissue can lead to syncope.