In the early stages of lung cancer, generally, there is no obvious impact on the appetite. Most early-stage lung cancers do not show clinical symptoms. However, some patients may experience coughs or blood-streaked sputum if the tumor grows along the inner wall of the airway, stimulating the respiratory tract. Nevertheless, early-stage lung cancer typically does not metastasize or spread to the digestive tract. Thus, early-stage lung cancer usually does not affect the patient's appetite, and the patient's appetite generally remains unaffected. However, it is crucial to diagnose early-stage lung cancer because surgical removal at this stage can often achieve good results. Once it progresses to mid or late stages, the outcomes are usually poor, and the survival period is typically short. Therefore, it is advocated that people at high risk for lung cancer undergo regular chest CT screenings to check for early-stage lung cancer.