The clinical symptoms of pulmonary hypertension are not specific. When symptoms such as shortness of breath, syncope and chest pain occur and cannot be explained by common cardiac or pulmonary disorders, the possibility of pulmonary hypertension should be thought of and echocardiographic screening should be performed as soon as possible to shorten the time to diagnosis for patients. Echocardiography is an important noninvasive screening tool for pulmonary hypertension. If the echocardiogram shows a tricuspid regurgitation velocity greater than 2.5 m/s, or high-risk signs such as right atrial or right ventricular enlargement, or if the estimated pulmonary artery systolic pressure at rest is greater than 30 mmHg, pulmonary hypertension should be considered, and further right heart catheterization should be performed. If the estimated pulmonary artery systolic pressure is greater than 40 mmHg, then it is clear that the patient has pulmonary hypertension.