Over the years, cancer has claimed countless lives and is the second cause of human death. It is called an incurable disease and people are afraid of talking about cancer. Many patients have been influenced by this concept and become pessimistic and disappointed, and their spirit collapses, so they do not go for treatment. Almost everyone has a loved one or someone close to them who has cancer, so everyone has the same pain and fear. Is cancer really an incurable disease? The author takes this corner to talk about how to understand cancer correctly, treat it reasonably and treat it optimistically. First of all, we must understand cancer correctly. Cancer is the result of long-term qualitative changes of normal cells in biological organism due to many external (including physical, chemical and biological factors) and internal factors (including genetic, endocrine disorders and malnutrition, mental tension, etc.), and thus has the ability to proliferate excessively. Cancer is a disease, but not every patient who has cancer will die from it. Like other chronic diseases (e.g. hypertension, diabetes), cancer is only one of the problems of a healthy life and is not incurable with systematic treatment. Cancer is a state of imbalance between human beings and nature, a state of imbalance between the internal organs of the human body. The root cause of “cancer state” is that modern people’s living habits go against this natural law. The “healthy state” has gradually entered the “cancer state”. Cancer can be detected at an early stage. When the following symptoms appear, they are often the early manifestations of cancer, such as choking sensation when swallowing food; pain in the upper abdomen; irritating cough that doesn’t heal for a long time or bloody sputum; breast lumps; abnormal vaginal bleeding; blood in the nose and nasal congestion; blood in the stool; headache and vomiting; long-term unexplained fever and so on, they can be diagnosed early if they go to the hospital in time. Cancer can be prevented. We can reduce the occurrence of cancer by removing carcinogenic agents from the environment, improving poor lifestyle and diet, etc.; we can improve early diagnosis through screening and monitoring of high-risk groups, thus improving the effectiveness of early treatment. What should we do when we have cancer? Reasonable management of cancer is the right choice. We understand that once a person knows that he or she has cancer, it is psychologically difficult to accept it at once. You may think that the doctor has made a mistake, you may not be able to accept the fact that you have cancer, your family and friends may think that this is never possible …… In short, you and those around you will deny this pre-existing fact. Denial can bring expectation because it will give you time to adjust to the change; however, sometimes denial can become a serious problem that will delay your chance for systematic treatment. There are many misconceptions about the treatment of cancer. Some people think that early detection and diagnosis will not help; some people think that surgery, radiotherapy and chemotherapy have too many side effects; some people think that everything will be fine after surgery to remove it; some people think that prescriptions are all-powerful and all-inclusive; some people think that cancer can be treated just by support; some people think that cancer in the elderly cannot be treated and there is no need to treat it …… In fact Many cancers, as long as they are detected early, can be completely cured by the existing comprehensive treatment techniques (surgery, radiotherapy, chemotherapy, molecular targeted therapy, immunotherapy, etc.), and for middle and late stage malignant tumors, radiotherapy, chemotherapy and molecular targeted therapy are the most important treatments, and some patients can be cured, while most patients can also alleviate their symptoms, prolong their survival and improve their quality of life. It is said that a good state of mind is an important condition for cancer recovery, and this truth tells us how we should treat cancer with optimism. The bad psychological manifestations of tumor patients mainly include fear, pessimism, depression, vulnerability, sensitivity, anxiety, hatred and denial. Under the long-term emotional depression and mental stress, the central nervous system and limbic system of the brain are overstressed, and asynchronous mechanisms occur. Through the action of steroids, the thymus gland degenerates, which affects the maturation of T lymphocytes and the reduction of cellular antibody production, which not only weakens the immune function, but also easily causes the genetic program to be wrongly epiphenomenal and increases the body’s sensitivity to cancer-causing factors. Positive emotion can make patients actively cooperate with medical personnel to take various necessary treatment measures and tolerate the toxic side effects of certain treatment measures to complete the required course of treatment, thus improving the treatment effect of malignant tumors. Optimism can make patients treat cancer as an incurable disease correctly from an ideological point of view and believe that cancer can be overcome. This enables patients to live and work like normal people, which improves their quality of survival and increases the possibility of long-term control and even clinical cure of cancer. A good psychological state makes patients emotionally uplifted and take the initiative to take effective rehabilitation measures and can adhere to them for a long time.