If patients have often felt tightness in the chest in recent days: First, cardiogenic diseases should be considered, such as coronary artery disease unstable angina, acute myocarditis, acute pericarditis, infective endocarditis, hypertrophic obstructive cardiomyopathy, or malignant arrhythmia, heart failure, all these conditions can lead to coronary artery ischemia, stenosis, spasm, triggering insufficient blood supply and oxygen supply to cardiomyocytes, which leads to chest tightness, shortness of breath, palpitations and other symptoms. Second, for respiratory system diseases, such as acute attacks of chronic bronchitis, asthma attacks, bronchiectasis, chronic obstructive pulmonary emphysema, pulmonary heart disease, or large lung infections, pleurisy, these conditions will also have symptoms of chest tightness. Thirdly, if the patient has endocrine metabolic diseases, this will also be manifested when the thyroid gland is hyperfunctioning. Fourth, for patients with plant nerve disorders, especially in cardiac neurosis, this symptom may also occur.