Chest pain is a common symptom in clinic, which is mainly caused by chest diseases, and a few are caused by other diseases. The symptoms of chest pain should be combined with the patient’s comprehensive manifestations and the results of auxiliary examinations to determine whether lung cancer is present. Clinical diagnosis is often based on the age of onset, location of chest pain, nature of chest pain, duration of pain and factors affecting the pain. 1. Age of onset: Chest pain in young adults should be considered as a symptom of other diseases, while patients over 40 years old should pay attention to angina pectoris, myocardial infarction and bronchopulmonary cancer. 2. Location of chest pain: pain caused by lung cancer is mainly in shoulder and axilla, radiating to the inner side of upper limbs, and there may be pleural pain when lung cancer metastasizes to pleura. 3. Nature of chest pain: The degree of chest pain can be severe, mild and hidden. The nature is diverse. Chest pain caused by lung cancer is often persistent, fixed and intense. 4. Duration of pain: pain caused by lung cancer is often persistent and cannot be relieved. 5. Factors affecting pain: chest pain caused by lung cancer can be aggravated by coughing or breathing. If you have chest pain, you should consult doctor in time and complete relevant examination such as lung CT to make clear diagnosis and early treatment.