Lung cancer does not necessarily cause coughing, for example, early stage lung cancer is often asymptomatic and most of the early stage lung cancer is detected through physical examination. In contrast, advanced lung cancer is accompanied by various symptoms, such as coughing and coughing up blood. Along with coughing, it may also be accompanied by cough-induced pain, and even lung cancer may metastasize and produce corresponding symptoms in other parts of the body. Early stage lung cancer may not have coughing symptoms, but it requires close medical checkups, such as annual medical checkups, especially for high-risk groups, such as gay men, over 40 years old, and smokers, who must go for regular annual medical checkups to find out if there are any problems so that they can be dealt with early.