Pulmonary hypertension is a relatively complex disease with many types, and the department to which a patient should go depends on the type. For example, patients with idiopathic pulmonary hypertension often need to visit the department of cardiology. Similarly, pulmonary hypertension associated with left heart disease also falls under the jurisdiction of cardiology. However, if the pulmonary hypertension is related to hypoxia, these patients typically belong to the department of respiratory medicine. Furthermore, there are cases of chronic thromboembolic pulmonary hypertension, where patients can be seen either in cardiology or respiratory medicine. Therefore, answering which department pulmonary hypertension belongs to is a complex issue that requires classification based on the cause of the disease.