Tumor has become the second biggest killer threatening human life. Due to the lack of knowledge related to tumor, people talk about cancer and there are many misunderstandings in the concept, which also seriously restrict the improvement of overall tumor treatment level. People often have the following three misconceptions about tumor prevention and treatment: Misconception 1: Cancer causes are unclear and cannot be prevented This view is very wrong. More than 80% of the causes of cancer are caused by environment, especially related to certain cancer-causing chemical factors in the environment. Since cancer is closely related to people’s environment, the medical profession also refers to cancer as “lifestyle disease”. Studies have found that if one maintains good living habits, the chance of cancer will be reduced by more than 1/3. Myth 2: Once cancer is found, the patient should be kept secret. Once cancer is found, the patient should be treated in time and informed in an appropriate way and time, and cooperate with the doctor for treatment, which will greatly improve the patient’s chance of recovery. However, the reality is that after a person is diagnosed with cancer, family members and friends and relatives are worried that they cannot bear the shock and try to keep it a secret. For this reason, relatives and friends are afraid to send the patient to the oncology hospital. Some of them even dare not buy “national medicine” anti-cancer drugs for the patient in order to conceal it from the patient, but buy some health care products instead, thinking that they are well-intentioned, but actually they are harming the patient. Therefore, patients should not be afraid of “cancer” and should receive regular treatment as soon as possible. Myth 3: No need to treat cancer when it is advanced Although advanced cancer is difficult to be treated, with the continuous improvement of treatment level, especially traditional Chinese medicine in China, it has unexpected effects in the treatment of advanced cancer. The clinical study of tens of thousands of advanced cancer patients in China by the National Expert Committee of Integrative Medicine against Cancer has confirmed that the reasonable use of anti-cancer Chinese medicine combined with other treatment means for integrated treatment will greatly extend the life span of advanced cancer patients and improve their quality of survival.