Bone tumors are tumors that occur in bones or their affiliated tissues, and can be benign or malignant. Malignant bone tumor is often called “bone cancer”. They are divided into primary malignant bone tumors, the cause of which is still unclear, and secondary malignant bone tumors, which are mainly caused by the metastasis of cancer cells from other parts of the body. 1. Primary bone malignant tumor: the cause is still unclear, but it may be related to genetic mutation, long-term exposure to chemical and radioactive substances, long-term infection and so on. 2. Secondary bone malignant tumor: it is mainly due to the metastasis of tumors from other organs to bones through blood and lymph nodes, such as breast cancer, lung cancer, prostate cancer, kidney cancer, liver cancer, etc. If one suffers from chondrosarcoma, chondrocytoma, lymphoma, etc., the cause is not clear yet. If one suffers from benign bone tumors such as chondroma and osteochondroma, secondary bone malignant tumors can also occur due to malignant transformation of the disease. Usually, patients with bone malignant tumor will have symptoms such as bone pain, local swelling, bone and joint dysfunction, pathological fracture and so on. Some patients are also prone to other symptoms such as emaciation, loss of appetite, weight loss, etc., which affect the quality of life and health. It is recommended that people diagnosed with bone malignant tumor actively cooperate with doctors to control the progress of the disease and relieve the discomfort. Patients should also adjust their mindset and keep themselves happy physically and mentally.