With the acceleration of the information age, people’s understanding of the unknown has crossed from books to network search. For tumor Jun, people are more and more aware of its horrible prognosis, while more and more people understand the importance of medical checkups. Chest CT, as a common means of tumor screening, is an important part of the medical checkup program. Many people feel that the sky is falling when they get the CT report and see the “lung nodule” written on it. As an oncologist, I often receive many calls from relatives and friends: I (my relative) found a nodule in my lung during physical examination, is it a tumor, should I operate, is it advanced, and so on. This makes me feel that it is very necessary to give you some information – what should we do when we find a nodule in the lung during physical examination. First of all, don’t panic, consult and trust a specialist, not a friend with a medical background. Medicine is a big category, and modern medicine is very finely divided. The gap between specialist and non-specialist doctors in understanding tumors is as big as the gap between carpenter and cement maker in understanding bookcases, not to mention the gap between medical students, nurses and specialist doctors. Many people worry about panic, often as a result of finding a nodule and getting a look from a pony reading information engineering at the medical university next door, who said it was likely to be a tumor. Second, many nodules are not tumors, and many tumors are not cancer. There are many possibilities for lung nodules, such as tuberculosis, lung fungal infections, small granulomas in the lung, lung tumors (tumors are divided into benign and malignant, and malignant ones are lung cancer), etc. You may even have grown such a nodule since you were a child, only that you have not had a CT scan before. In order to diagnose the nodules, we need to combine other related tests, such as whether there are recent manifestations of coughing and hemoptysis, chest tightness and pain, shortness of breath, or whether the tuberculin test is positive, or what the tumor markers are. This brings us back to the first point, don’t panic, go to a specialist and trust him. Finally, regular review. Due to various conditions, not all places are easy to review. Therefore, we can have selective checkups. Here, the following two items need special attention to perform: firstly, blood sampling for tumor markers; secondly, if there is only one nodule and the diameter is less than 8mm, you can review it after 3-6 months, and if the volume does not change, you can review it again in 6-12 months. However, if there are 2 or more nodules, or a single nodule is not less than 8mm in diameter, in these cases, it is still recommended to see an oncologist and please trust him, i.e. the first point. Last but not least, many people ask if there is any dietary contraindication. Before the diagnosis of tumor, there is no dietary contraindication, you can eat whatever you want, just no smoking. You also have to keep your mood relaxed. Although there is insufficient evidence on the relationship between mood and disease, it is commonly believed clinically that people with bad mood have poor quality of survival, whether they are sick or not. If there are people who say that they can only choose between not smoking and staying in a good mood, then, not smoking.