The most common factors are organic heart disease, such as coronary artery disease, unstable angina, myocarditis, pericarditis, infective endocarditis, heart valve disease, congenital heart disease, hypertrophic obstructive cardiomyopathy, hypertensive heart disease, dilated heart disease, all of which can lead to ischemia, spasm, and stenosis of the coronary arteries of the heart, resulting in a pain in the precordial region. In patients with cardiac neurosis, there is no organic lesion in the heart, but the pain in the precordial region may occur when there is a disorder of the vegetative nerves. 3, For respiratory system diseases, such as large pneumothorax, pleurisy, lung infection, pleural effusion, the above clinical manifestations may also occur.