There was no nodule in the lung ct half a year ago, whether it will develop into lung cancer now still needs to be determined by combining clinical manifestations and examination. Lung cancer is a malignant tumor associated with smoking, environment and many other high-risk factors, and often develops into localized malignant nodules first, and the fact that no nodules were found in the ct examination performed six months ago does not mean that it is the specific situation now. Lung nodules may be related to lung inflammation, tuberculosis, benign tumors, lung cancer and other diseases, and do not necessarily develop into lung cancer. When lung nodules are found, they can be evaluated with accompanying symptoms, such as cough, sputum, hemoptysis, chest pain, fatigue, fever, emaciation and other clinical manifestations if the nodules are lung cancer. If there are similar symptoms, one should go to the hospital in time for examination and diagnosis of lung cancer through ct and pathological biopsy. Therefore, on the one hand, if you have similar symptoms, you should consult a doctor in time; on the other hand, you need to have regular medical checkups to detect or exclude the disease as early as possible.