Many benign diseases can be called cured when symptoms and signs disappear and functions are restored after treatment. However, this is not the case for malignant tumors. After the first stage of surgical operation or radiotherapy treatment, it is necessary to continue the planned comprehensive treatment and regular examination and follow-up, which is one of the characteristics of malignant tumor treatment. As a systemic disease, the residual cancer cells in the body will re-proliferate after stopping treatment or when the body’s resistance decreases causing recurrence and metastasis. Even for patients who are cured, metastasis may still occur after 5 years. The possibility of the second primary cancer in patients suffering from cancer must also be paid attention to, as early detection, early diagnosis and early treatment can be achieved through follow-up. Therefore, patients and their families should pay attention to follow-up. Usually tumor patients pay more attention to the recent follow-up. With the improvement of physical condition and the end of treatment, patients relax about the follow-up, and some even ignore the follow-up letters sent by hospitals. In fact, the treatment of tumor is long-term. Although the disease is in remission after surgical resection and multi-method comprehensive treatment, it still cannot be regarded as cured. On the one hand, it can detect the recurrence or metastasis of tumor in time and give timely and reasonable treatment so that it can be better controlled; on the other hand, it is convenient for doctors to follow up and observe the patients, grasp first-hand information and accumulate experience, which is conducive to the development of scientific research and improvement of business level and better service for patients. Doctors answer patients’ questions in time and follow-up visits should not be interrupted. To a certain extent, the follow-up of tumor patients should be lifelong.