Lung adenomas are divided into benign and malignant, with most benign ones having an envelope and growing slowly. Malignant ones usually show infiltrative and destructive growth, and are poorly demarcated from the surrounding tissues. Both benign and malignant lung adenomas present with symptoms such as cough, sputum, chest pain, chest tightness and low-grade fever at the initial stage of development. Benign ones generally show expansive growth, are well demarcated from normal tissues, most of them have an envelope and grow slowly. Malignant adenomas usually show infiltrative and destructive growth, without peritoneum and grow rapidly, and are not clearly demarcated from the surrounding normal tissues, and if the blood supply is insufficient, necrosis and ulceration may occur. Benign lung adenomas can usually be cured by timely surgical resection and active postoperative care. Malignant lung adenoma, i.e. lung adenocarcinoma, can be controlled by surgery, chemotherapy, radiotherapy, targeted therapy and immunotherapy. It is recommended that patients with lung adenoma should go to regular hospitals for consultation in time so as to avoid delaying their condition.