What department to call for chest tightness needs to consider other symptoms and past medical history. If it is accompanied by severe chest pain or dyspnea, you can first call the emergency medicine department for investigation. If it is accompanied by chest pain and change in blood pressure, then cardiology; if it is accompanied by cough and sputum, then respiratory medicine. Chest tightness is generally related to impaired cardiopulmonary function: if the heart function is affected, the pumping ability of the heart muscle decreases, and symptoms of heart failure may appear, and due to pulmonary stasis, symptoms such as dyspnea and chest tightness and breath-holding may appear. It is common in conditions such as hypertensive heart disease, coronary artery disease, and heart valve disease. If a patient has an episode of chest tightness along with a previous history of heart disease, a cardiology appointment is appropriate. Cardiac enzymes, troponin, electrocardiogram, echocardiogram, coronary CT, cardiac MRI or coronary angiogram can be used to clearly rule out heart disease problems. Pulmonary function, if affected, may present with chest tightness and dyspnea. For example, in lobar pneumonia, chronic obstructive pulmonary disease lung cancer, spontaneous pneumothorax, pleural effusion, etc., the pulmonary air exchange function is impaired and the patient will feel chest tightness and breathlessness. Chest X-ray, lung CT, bronchoscopy and other examinations can be used to clearly rank whether there are conditions such as lung infection or tumor. If no organic pathology is found after cardiopulmonary function tests, functional diseases such as cardiac neurosis or psychological causes should be considered, and further treatment can be provided at the psychosomatic medicine clinic.