Lung adenocarcinoma may recur 3 years after surgery, but generally the probability of recurrence is not high, and most of the patients tend to recur in 1~3 years after surgery. The recurrence of lung adenocarcinoma after surgery is affected by many clinical factors, such as the staging of the patient at the time of surgery, the malignant degree of lung adenocarcinoma, and the effect of radical treatment, etc. Generally speaking, the earlier the staging, the lower the recurrence rate, the worse the adenocarcinoma differentiation, the higher the malignant degree, the higher the recurrence rate, and the more complete the surgery is and the absence of cancerous residuals, then the lower the recurrence rate in general. Since there is a possibility of recurrence of lung adenocarcinoma 3 years after surgery, it is still recommended to follow up and review 3 years after surgery, and it is generally recommended to review every 4-6 months to monitor the changes of the disease and to find out the recurrence in time and treat it in time.