There is no 1-second self-test for lung cancer. Early symptoms of this disease are not specific and may be similar to the symptoms of non-lung tumor diseases, so self-testing is generally not recommended, and you should go to the hospital, have a comprehensive examination, and make a clear diagnosis. Lung cancer is a kind of malignant tumor that originates from the lung. In most cases, there may be no obvious symptoms in the early stage of lung cancer, and clinical symptoms, such as cough, blood in sputum, wheezing, chest pain, hoarseness and so on, will appear only when the disease develops to a certain stage. Moreover, clinical manifestations vary, so lung cancer cannot be detected on its own and is easily misdiagnosed as other non-lung tumor diseases. It is recommended to have regular medical checkups in general, especially for people with high risk factors, such as family genetic history, long-term exposure to asbestos, formaldehyde and other cancer-causing factors at work, viral infections, chronic lung diseases, and so on. When patients suddenly develop the above symptoms for unknown reasons, they need to go to the hospital in time for relevant examinations, such as chest X-ray, chest CT, bronchoscopy and so on. When suspecting that you have lung cancer, you must go to the hospital in time for a comprehensive examination to rule out or make a clear diagnosis in time, and cooperate with the doctor to carry out standardized treatment, and do not make judgment on your own, so as not to delay your condition.