Whether patients need retreatment after radiotherapy for lung adenocarcinoma depends on the effect of radiotherapy. If the effect is good and the cancer cells have been eliminated, then there is no need for further treatment; if the cancer cells still exist, then patients need to undergo radiotherapy again or other treatments such as chemotherapy or targeted therapy. 1. Cancer cells disappeared after radiotherapy: lung adenocarcinoma is a type of lung cancer, if the cancer cells are found to have disappeared after radiotherapy, then there is no need for further treatment, and regular rechecking is enough; 2. Cancer cells still exist in the body after treatment: if the cancer cells are reduced or remain unchanged after radiotherapy, this kind of situation still needs to continue treatment, and the cancer cells can be completely eradicated through continuing radiotherapy, surgery, chemotherapy and other treatments to promote the recovery of the patient. Whether a patient needs to continue treatment after radiotherapy for lung adenocarcinoma should be judged according to the patient’s specific situation, and each person’s response to radiotherapy is different, and the subsequent treatment will also be different. Patients do not need to worry too much and should actively cooperate with doctors for treatment.