Left chest pain registered specific to go to which department, mainly combined with the condition itself comprehensive investigation, causes corresponding to the condition of the causes include coronary heart disease, pneumonia, lung cancer, costochondritis, breast disease and trauma, etc., need to go to the Department of Cardiology, respiratory internal medicine, thoracic surgery, orthopedics, breast, and emergency. 1. Coronary heart disease: It is closely related to the narrowing of coronary arteries. Insufficient blood supply to the heart muscle will cause corresponding symptoms, and it is necessary to go to the Department of Cardiology for examination. 2. Pneumonia: after lung infection, inflammation stimulation of pleura will cause corresponding changes, need to go to respiratory medicine for further investigation, regular application of anti-inflammatory drugs. 3. Lung cancer: suspected malignant tumor in the lungs, need to go to thoracic surgery for further investigation, and need surgical resection if necessary. 4. Osteochondritis dissecans: caused by bone and joint problems, closely related to trauma and infection, need to go to thoracic surgery for further examination, and then do standardized treatment. 5. Breast disease: Breast fibroadenoma, breast cancer, etc. can cause related symptoms, you can go to the breast department for further investigation, and then do the treatment after diagnosing the condition. 6. Trauma: Trauma can also cause pain in the corresponding area. To confirm the diagnosis, you can go to the emergency room for observation. Left-sided chest pain accompanied by obvious coughing, coughing up blood and other symptoms, you need to consult a doctor in a timely manner, go to the appropriate department for examination, under the guidance of clinicians for standardized treatment.