Cor pulmonale, also known as pulmonary heart disease, refers to the increased pulmonary vascular resistance caused by pathological changes in the bronchi, lung tissue, thorax, or pulmonary vessels, leading to pulmonary arterial hypertension and subsequent structural and functional changes in the right ventricle. This condition is clinically referred to as cor pulmonale. The causes of cor pulmonale can be divided into three main categories: The first category is diseases of the bronchi and lungs, such as chronic obstructive pulmonary disease (COPD), which accounts for approximately 80%-90% of cases. Other causes include bronchial asthma, bronchiectasis, severe pulmonary tuberculosis, interstitial pneumonia, and more. The second category involves diseases related to disorders of thoracic cage movement, such as various thoracic deformities, kyphoscoliosis, spinal tuberculosis, arthritis leading to extensive pleural adhesions, and deformities caused by thoracic plastic surgery. The third category includes pulmonary vascular diseases, such as pulmonary arterial hypertension, pulmonary thromboembolism, and other conditions leading to narrowing or blockage of pulmonary arteries, all of which can progress to cor pulmonale.