Pulmonary hypertension P2 hyperfunction is defined as an increase in the second heart sound in the area of auscultation of the pulmonary valve, which is the second intercostal space at the left edge of the sternum.P2 hyperfunction is mainly caused by elevated pulmonary artery pressure, most of which is of pathological origin, and can be found in pulmonary heart disease, whose etiologies include chronic obstructive pulmonary emphysema, chronic bronchitis, pulmonary tuberculosis, pulmonary embolism, etc.P2 hyperfunction is also seen in congenital heart disease with right and left shunts, such as atrial septal defects, ventricular septal defects, and ductus arteriosus, and can be seen in patients with mitral stenosis. P2 hyperfunction occurs when pulmonary artery pressure increases. P2 hyperfunction detected on auscultation must be diagnosed and treated in the hospital on the advice of the doctor, and relevant examinations such as cardiac ultrasound and chest CT must be performed to clarify the cause of the disease.