Stage 1a lung adenocarcinoma belongs to the early stage of lung cancer and its severity is relatively low. Stage 1a lung adenocarcinoma refers to the early stage lung adenocarcinoma when the largest diameter of the lung cancer tissue is less than 1cm, surrounded by lungs or dirty pleura, not involving bronchial tubes as shown by bronchoscopy, without regional lymph node metastasis and distant metastasis, and confined to the lungs and dirty pleura only. The first choice of treatment for stage 1a lung adenocarcinoma is radical surgery, in which all tumor tissues are removed by traditional open-heart surgery or thoracoscopic surgery, and radiotherapy, chemotherapy and other auxiliary treatments are not needed before and after surgery. The overall five-year survival rate is nearly 90%. If a patient is diagnosed with stage 1a lung adenocarcinoma, it is not serious because early symptoms are not obvious and have little impact on the quality of life, and most of them can be cured through radical surgery. It is recommended to go to regular hospitals in time, follow the advice of specialists for standardized diagnosis and treatment, and follow up regularly.