Running is a strenuous exercise, and running in patients with pulmonary arterial hypertension may lead to a lack of oxygen in the lungs and further aggravate pulmonary arterial hypertension. Running is a sport that requires high cardiorespiratory fitness, and it is very likely that a large amount of air will enter the lungs and the heart rate will increase during the exercise. Patients with pulmonary arterial hypertension may experience shortness of breath, fatigue, angina, etc. After the activity, and due to the thin wall of the capillaries in the lungs of patients with pulmonary arterial hypertension, when a large amount of air enters the lungs, it may lead to the rupture of the capillaries in the lungs, resulting in the occurrence of pulmonary bleeding, pain, etc., and it will aggravate the ischemia of the heart and aggravate the occurrence of angina pectoris. Therefore, running is not recommended for patients with pulmonary arterial hypertension, but you can choose mild exercise such as walking, tai chi, etc. If there is any abnormality, you should consult a doctor in time.