In this day and age where cancer is talked about, bone tumors are even more frightening and enough to make normal people lose their mind. In fact, even bone tumor, if it can be detected at early stage and treated timely, the prognosis is not so bad. 1.Local skin changes Some malignant tumors are very rich in blood transport, and the local skin can show obvious increase of skin temperature, and some of them can even see obvious veins, i.e. superficial venous anger. For malignant bone tumor, the pain is mild and intermittent at the beginning, but will be persistent at the later stage, and the pain will be aggravated at night, and the faster the growth rate of the tumor, the more obvious the pain is; for some benign bone tumors, the pain can be caused by the growth of the bone. Especially, for adolescents, if there is unexplained swelling and pain around the knee joint, they should pay enough attention to it and seek medical examination in time. 3. Local swelling and mass Most benign tumors are slow-growing masses with hard texture and clear boundaries with surrounding tissues, which are mostly found unintentionally if there is no obvious pain. For bone tumors growing near joints, patients will have limited joint activities due to pain and swelling. For bone tumors growing on the spine, when the tumor invades the spinal cord and nerves, it will lead to abnormal sensation and movement of limbs, and in severe cases, it may lead to paralysis. At the later stage of bone tumor, patients can have systemic symptoms, such as loss of appetite, emaciation, anemia, weight loss, fever and other symptoms. In addition, because the bone tumor eats away the normal “bone”, a slight trauma can cause pathological fracture.