Pulmonary arterial hypertension is a commonly seen clinical condition with complex causes, which may arise from various cardiac, pulmonary, and pulmonary vascular diseases. When pulmonary arterial hypertension occurs, due to increased resistance in the pulmonary circulation, the load on the right heart will increase, eventually leading to right heart failure, thus causing a series of clinical manifestations. In the early stages, pulmonary arterial hypertension may not present with obvious symptoms, and discomfort may be felt during intense exercise, with most patients showing shortness of breath after activity. During the compensatory period of pulmonary heart function, symptoms such as palpitations, shortness of breath, fatigue, and decreased endurance may occur during activities, and acute infections can also exacerbate these conditions, potentially causing mild chest pain or hemoptysis. Some patients may exhibit signs of heart dysfunction, like coughing and expectorating phlegm.