Abstract: As one of the most common tumors, lung cancer imposes a major disease burden in the world. Lung cancer is rare among young people, and there is no conclusion about the concept and incidence of lung cancer in young patients. Different researches have different results about the difference between young and old patients with lung cancer on clinical epidemiologic characteristics, histological types, prognosis and gene mutation. This paper aims to clarify the research progress on lung cancer in young patients and provide evidence and direction for future researches.