As a doctor, we often encounter such scenarios where someone will complain to God as soon as they are found to have a tumor: “Why am I so unlucky? How can fate be so unfair to me?” In fact, most people ignore the fact that the culprit of tumor is not others, but the patient himself! According to the report of World Health Organization, 80% of tumors are caused by poor lifestyle and environment. According to the World Health Organization, 80% of tumors are caused by poor lifestyle and environment. High fat, high calorie, low fiber diet and lack of exercise are the main reasons for the onset of many tumors and their rejuvenation; while the high incidence of lung cancer, stomach cancer and liver cancer is closely related to factors such as increased environmental pollution, increased smoking and consumption of moldy food; increased pressure of urban life and psychological factors affecting immune function are also important triggering factors for tumors. Therefore, tumor prevention should start from improving lifestyle, and good living habits, reasonable dietary structure and healthy psychological quality are the key to prevention. Remember: your daily behavior and habits are the important determinants of whether you will get cancer or not. A healthy lifestyle is the golden key to prevent cancer! The key to cancer prevention is yourself! Smoke one less cigarette, drink one less glass of wine, eat a balanced diet and exercise properly – it is that simple to prevent cancer. At the same time, regular medical check-ups are also one of the important means to prevent cancer, because most cancers do not just come, they are formed slowly over a long period of time. If we can interrupt its process during its formation, we can prevent cancer from occurring. For example, some infectious diseases have been proven to induce malignant tumors, such as the occurrence of liver cancer associated with hepatitis virus and the occurrence of cervical cancer associated with infection with human papilloma virus. We are fully capable of detecting these lesions in time through medical checkups and giving timely and appropriate treatment measures in order to prevent the occurrence of related cancers. However, nowadays, many of us, especially middle-aged people, often use busy work and good health as excuses not to go to hospitals for routine medical checkups. In fact, in recent years, the incidence of tumor in our country has shown an obvious trend of youthfulness. Clinically, many liver cancer patients, once they come to the hospital with obvious discomfort, are often in the middle and late stages of the disease and have lost the best chance of cure.