Coughing up blood generally refers to hemoptysis. Typical complications of pulmonary hypertension include hemoptysis, which can lead to rupture of blood vessels in the lungs and massive hemorrhage, which can be self-healing in mild cases or life-threatening in severe cases. Pulmonary hypertension is a disease characterized by abnormally high pulmonary arterial pressure due to its own respiratory or circulatory system diseases, drug effects, genetic factors, and so on. Typical complications include arrhythmias, hemoptysis and mechanical pneumonia. Hemoptysis is also an important factor in accelerating death in people with pulmonary hypertension. The source of the hemoptysis is usually a rupture of a malformed pulmonary artery under high pressure or a rupture of a bronchial artery that is compensated for by dilatation. Most people with hemoptysis can recover on their own, but untreated hemoptysis can be life-threatening, resulting in asphyxiation, severe infections, and even sudden death. Therefore, it is recommended to consult a doctor for timely treatment of similar symptoms under the guidance of a doctor.