Atypical adenomatoid hyperplasia is not considered as early stage of lung cancer, it is considered as precancerous lesion, but it needs to be taken seriously. Atypical adenomatous hyperplasia is a kind of pathological change under microscope, which can occur in many organs and tissues of the body. Clinically, there are often diseases such as atypical adenomatous hyperplasia of lung, atypical adenomatous hyperplasia of breast, etc. The cause of the disease is still unclear, and the symptom is insignificant at the beginning, and then there may be stuffiness and swelling of the chest and coughing with sputum. Pre-cancerous lesions are lesions that have the potential to become cancerous, and if they persist for a long time, they may turn into cancer under certain factors. Atypical adenomatous hyperplasia falls into this category. Atypical adenomatous hyperplasia of the lungs may cause lung cancer. It is recommended to go to the hospital in time if the pathology suggests atypical adenomatous hyperplasia.