Superficial organ tumors: Superficial organs refer to human skin, oral cavity, thyroid, breast, testes and superficial lymph nodes. These organs are on the surface of human body, which are the easiest to observe and the easiest for early detection by self. Tumors of these organs account for about 10%-20% of human tumors. 2.Cavity organ tumor: The characteristic of cavity organ is that there is a cavity in the center which is connected to the outside and the contents are excreted to the outside. The cavernous organs include nose, pharynx, trachea, lung, esophagus, gastrointestinal tumor, kidney, bladder, uterus and vagina. This type of tumor is characterized by cavity organ lining erosion, ulceration, bleeding, etc. causing cells to be shed from the cavity and excreted from the body. This kind of tumor accounts for 60%-70% of human tumors. Deep organs include bone, brain, liver, pancreas, spleen, ovary and prostate. Because of their deep location, they are not easy to see and touch, so their early cancer signals are not obvious and not easy to be diagnosed at an early stage, and they need ultrasound, X-ray, CT and MRI to be detected. These tumors account for 15%-20% of human tumors. 4. Soft tissue tumors: including fat, muscle, fiber, blood cells, lymphatic tissue and bone. The benign tumors occurring in these tissues are called tumors, such as lipoma, fibroma, etc. The malignant tumors occurring in these tissues are called sarcomas, such as liposarcoma, fibrosarcoma, etc. Since the early signals of these tumors are not obvious, they are not easily detected early.