The most common symptoms are chest tightness, shortness of breath, shortness of breath, weakness, dizziness, chest pain after activity, accompanied by palpitations, transient blackness in front of the eyes, and in more severe cases, patients will have syncopal episodes, dizziness, headache, and when combined with severe right heart insufficiency, patients will have swelling of the lower limbs, abdominal distension, abdominal pain, diarrhea, nausea, vomiting, and poor circulation. In severe pulmonary hypertension, severe coughing and coughing of blood may occur.