In recent years, cancer has become a “killer” threatening people’s health. Although cancer is dangerous, there are reasons for it, and as long as it is treated seriously, cancer can be prevented and treated, and the earlier the treatment, the better the effect. All kinds of tumors have their preventive measures, such as lung cancer prevention, first of all, we should quit smoking, stay away from second-hand smoke pollution, try to avoid outdoor air pollution and kitchen fumes; indoor decoration should be made of environmentally friendly materials; we should eat more fresh vegetables and fruits, with a reasonable mix of coarse and fine grains and a reasonable intake of various nutrients; we should also maintain an optimistic and positive attitude towards life, an open and transcendent outlook on life, learn to self-regulate various situations of tension and stress, and improve the quality of life. In addition, we should maintain an optimistic and positive attitude towards life, an open and transcendent outlook on life, learn to self-regulate tension and stress in various situations, and improve our psychological adaptability, resilience, tolerance and pleasure. If you can do the above, the risk of developing tumor will be greatly reduced, which is the primary prevention. Of course, if primary prevention cannot stop the occurrence of tumor, secondary prevention, i.e. early diagnosis and early treatment, will also stop the progress of tumor at this time. Tertiary prevention is to prevent the deterioration, recurrence and metastasis, prolong the survival period and improve the quality of life of patients, and promote the recovery. As long as everyone attaches importance to tertiary prevention, the incidence of cancer can be reduced to a great extent, which not only can save medical resources, but more importantly, people can enjoy a healthy and happy life without suffering from diseases. We sincerely wish everyone enjoys good health!