The “three early stages” of tumor treatment include early prevention, early diagnosis and early treatment, which reflects a scientific concept of cancer prevention and fight against cancer, emphasizing the elimination of early stage tumors in the nascent state, so that patients with middle and late stage tumors can get better through treatment and even recover and improve their quality of life. The exact cause of tumor occurrence is still not very clear, but it does not mean that people do nothing in front of tumor. International Union Against Cancer believes that 1/3 of malignant tumors can be prevented, 1/3 of malignant tumors can be cured if diagnosed early, 1/3 of malignant tumors can reduce pain and prolong life. With the continuous improvement of comprehensive tumor treatment, the survival period of some tumor patients has been extended and the quality of life has been significantly improved. To achieve the “three early stages”, first of all, medical knowledge should be popularized to the public, so that they can have a more comprehensive understanding of the causes, early manifestations, common symptoms, prognosis and self-examination methods of tumors. Like many other diseases such as hypertension, coronary heart disease and diabetes, cancer is also a preventable and treatable disease, which can be controlled and eliminated by taking corresponding measures against known risk factors to improve cancer prevention ability and prevent the disease before it happens. People often spare no money on tumor treatment, but seldom work on prevention before the onset of the disease. As a matter of fact, measures such as changing bad habits, avoiding smoking, promoting healthy diet (reducing fat intake and increasing dietary fiber), drug intervention for high-risk groups and early screening of cancer can prevent tumors and detect them at an early stage. In fact, there are often many danger signs of malignant tumors, as long as we pay attention to early identification, we can fight for the best treatment time and achieve good results. The common danger signs of malignant tumor are: gradually increasing lumps in superficial parts of the body; persistent abnormal digestion, long-term pain or lumps in the abdomen; persistent cough with blood in sputum; irregular vaginal bleeding in women after menopause; frequent nasal congestion, bloody nose, nosebleeds, neck lumps; blood in urine or stool; warts and moles, rapid growth or loss of sweat hair on the surface, or itchy local fluid secretion; unexplained weight loss or fever, etc. Therefore, for any discomfort in the body, you should go to the hospital in time to avoid missing the opportunity to detect early lesions. Secondly, we should raise the awareness of vigilance and strengthen the screening of people with family history, high incidence age and high incidence gender in areas with high incidence of tumor, so that once problems are found, we should seek timely medical treatment. In addition, insisting on regular medical checkups is beneficial to detect early tumors. After clear diagnosis, patients should actively cooperate with doctors for treatment.