Chest pain is not necessarily lung cancer, but it is important to rule out lung cancer. Chest pain is commonly caused by esophagitis, peptic ulcer, and coronary heart disease or costochondritis, and lung cancer is also one of the causes. The specific nature of chest pain should be judged by the comprehensive examination of lung CT, gastrointestinal endoscopy, electrocardiogram and pathology, and the specific nature of chest pain. If the chest pain is accompanied by acidity or indigestion, it is most likely caused by esophagitis or peptic ulcer. If the chest pain is accompanied by profuse sweating, it may be coronary angina, and if the chest pain is accompanied by coughing and blood in the sputum, be careful if it may be lung cancer, especially for patients who have been smoking for a long time. At this time, CT of the lung can reveal whether there is an occupying lung lesion, and further puncture pathology on the occupying lesion can clarify whether it is a case of lung cancer. In conclusion, there are many reasons for chest pain, not necessarily due to lung cancer.