Tumor, which is a new organism formed when developing or mature normal cells in the human body, under the long-term action of different factors, appear to overproliferate into abnormal differentiation. It is different from normal tissues and cells, does not grow according to the metabolic law of normal cells, but becomes unrestrained and uncontrolled. And the rapid growth is irregular. So much so that it can destroy the structure of normal tissues and organs and affect their functions. Tumor cells, compared with normal cells, have structural, functional and metabolic abnormalities, they have more than normal proliferation ability, this proliferation and the body is not coordinated. Non-tumor proliferation is different from tumor proliferation, the former often have obvious stimulus cause, and proliferation is limited to a certain degree and a certain time, once the elimination of this factor, that is no longer proliferation, but if beyond a certain limit, qualitative changes, can also become tumor proliferation. Malignant tumor cells can also infiltrate and spread to the surrounding, and even spread to other organs and tissues, continue to grow exponentially, causing great harm to the human body or life. All parts of human body are composed of different cells and tissues, except hair, teeth and finger (toe) nails, almost all organs and tissues and cells can develop tumors. Therefore, tumor is not a simple disease, but a large group of complex diseases, which is characterized by the uncontrolled growth of abnormal cells and spreading from the primary site to other places, and such spreading, if uncontrollable, will invade the vital organs and cause failure. This spread, if uncontrolled, will invade vital organs and lead to failure and eventually death. The human body can occur about four hundred different kinds of tumors, people often say that cancer is malignant tumors, in fact, this is a large group of diseases in general.