Pain is an important manifestation of cancer, and there is a difference between it and general pain. The main difference lies in the causes of pain, duration and treatment effect. 1. Cancer pain occurs mainly because tumor growth directly or indirectly presses, erodes and destroys the surrounding tissues and changes the anatomical structure and physiological changes around the tumor, resulting in pathological changes pain, while general pain is mainly due to tissue damage and inflammation stimulation resulting in pain and discomfort. In addition, if the tumor occurs in the abdominal cavity or pelvic cavity, it can compress the surrounding cavity organs and cause obstruction and other symptoms, and also cause obvious visceral pain. Under special circumstances, cancer tissues will directly release pain-causing chemicals to produce pain. 2. Cancer pain is a kind of chronic pain, which can last from the beginning of cancer until the failure of organs. Since cancer can metastasize, during the development of cancer, the pain can start from the first location where the cancer is found and extend to the site of metastasis. This pain usually lasts for a longer period of time. And the duration of ordinary pain varies. Pain caused by some external injury or inflammation stimulation can disappear quickly after cure or treatment. 3. The treatment of cancer is a worldwide medical problem. Pain may accompany the whole course of cancer. Although medicine is advancing, surgical techniques are improving, and various forms of chemotherapy, radiotherapy, molecular targeted therapy and other means are available, it is difficult to be cured in a complete and real sense due to the special nature of cancer, which leads to pain that is also difficult to be cured. In contrast, general pain, as long as the direct cause of the occurrence of pain is clarified, the pain can be cured quickly after treatment. Pain caused by cancer is an extremely common symptom of cancer, and it is relatively difficult to treat. In view of the diversity and complexity of cancer pain, comprehensive treatment is mostly used for cancer pain, including step analgesic drug therapy, nerve block therapy, nerve radiofrequency therapy and morphine pump therapy. For the more limited cancer neuralgia, nerve radiofrequency treatment usually has very good effect, while for the complex cases of generalized pain, intrathecal morphine pump can also solve the pain problem of patients. Of course, some cancers that are effectively treated can also have their pain effectively treated due to disease remission or temporary cure.