Non-small cell lung adenocarcinoma is a kind of lung cancer, which originates from the epithelium of bronchial mucosa, and a few of them originate from the mucous glands of the large bronchial tubes. Usually lung cancer can be divided into two categories: small cell lung cancer and non-small cell lung cancer, and lung adenocarcinoma belongs to non-small cell lung cancer, which is one of the common lung cancers. The development of lung adenocarcinoma is related to smoking, air pollution, cooking fumes, ionizing radiation, heredity and other factors. Among them, long-term heavy smoking is an important risk factor for lung adenocarcinoma. The age of onset of lung adenocarcinoma is generally lower than that of squamous lung cancer and small-cell lung cancer, and it is mostly of peripheral type. It usually grows slowly, but is prone to blood line metastasis in the early stage. Treatment methods for lung adenocarcinoma include surgery, radiotherapy, chemotherapy, targeted therapy, immunotherapy, etc. Patients should choose the appropriate treatment methods according to their tumor stage and physical condition. The prognosis of lung adenocarcinoma depends on early detection, early diagnosis and early treatment. Therefore, patients with high risk factors of lung adenocarcinoma can have regular medical checkups and receive timely treatment when abnormalities are found.