Patients may enter the follow-up process if they have been in continuous remission after completing the established treatment protocol. Although their disease is under control, these patients are not fully equivalent to ordinary healthy individuals. They will also face a series of issues such as physical and psychological recovery after anti-tumor treatment, potential long-term complications, disease recurrence, second tumor risk, and reintegration into family and society after treatment. Regular review is necessary because some lymphomas may relapse. Most of the disease recurrence occurs within the first 3 years. Regular follow-up review is an effective way to keep abreast of the tumor condition, and early detection and early treatment can also lead to a better outcome. In addition, the long-term adverse effects of radiotherapy and chemotherapy also need to be paid attention to, for example, the incidence of cardiovascular disease increases after several years of radiotherapy, patients need to be alert to the risk factors related to cardiovascular disease; second tumors can occur in the irradiated field after radiotherapy, if early detection and early treatment can be done during regular review, patients can still get better results. We have met a patient who was not able to review regularly after radiotherapy in the left supraclavicular region, and as a result, hemothorax appeared 6 years later and was finally diagnosed with left lung cancer. If the patient can review regularly, detect lung lesions early and operate, he still has a chance of long-term survival.