There is no accurate clinical method for self-testing lung cancer. Some patients can observe whether there are symptoms of irritating dry cough, chest tightness and shortness of breath in the early stage of cancer as the initial self-testing criteria to determine whether they are suffering from cancer. However, it should be noted that even the presence of corresponding symptoms does not definitively indicate that a patient has lung cancer, and it should be considered that such symptoms may be caused by various other factors, such as pneumonia and tuberculosis. Therefore, there are limitations in determining whether a patient has cancer by self-testing. If the above-mentioned symptoms persist for 2 weeks without remission, go to hospital for further diagnosis as soon as possible. In addition, most lung cancers usually have no obvious conscious symptoms in the early stage. If patients show obvious symptoms such as chest pain, hemoptysis, dyspnea, wasting and enlarged lymph nodes, it usually indicates that they have entered the middle and late stage of lung cancer. Therefore, it is not recommended to determine whether one has lung cancer through self-assessment. If you have uncomfortable symptoms or suspect the development of the disease, it is recommended to go to a hospital in time to clarify whether it is lung cancer through X-ray examination, CT examination, MRI, biopsy, endoscopy, sputum exfoliative cell examination, etc. In addition, people with family history of cancer, long-term smoking history, poor living habits and long-term exposure to harmful chemicals should pay more attention to regular medical checkups to help confirm the diagnosis and timely treatment so as not to miss the best treatment time.