In recent decades, with the rapid socio-economic development of China, the living standard of the people has improved significantly. The disease spectrum in China has also changed significantly, and cancer has become the number one killer threatening human health. At present, the incidence of cancer is showing a tendency of rejuvenation, which should be given sufficient attention. I. Reasons for the Rejuvenation of Cancer 1. Environmental Factors With the accelerated industrialization, environmental pollution is increasing, and carcinogenic substances in the environment are accumulating rapidly, which directly leads to the increase of cancer incidence. Atmospheric pollution directly increases the incidence of lung cancer; water and soil pollution can lead to the accumulation of carcinogenic substances in food through the pyramid effect of biological food chain, causing malignant tumors in the digestive tract; chemical materials contained in decoration materials and cosmetics can directly lead to blood system tumors, etc. 2. Own lifestyle change With the improvement of living standard, people’s lifestyle has also undergone significant changes; poor living habits, eating habits and sexual behaviors have increased the risk of cancer. The westernization of diet directly increases the occurrence of colorectal cancer and shows a clear trend of youth. Long-term smoking increases the occurrence of lung cancer and laryngeal cancer, and unclean sexual behavior leads to the younger incidence of cervical cancer, etc. 3.Social factors The current competitive society, fast-paced life and high work pressure often lead to psychological and mental problems, which are all related to the occurrence of cancer. Psychological studies have long confirmed that cancer is a physical and mental disease; and most studies have also concluded that the occurrence of cancer is related to certain specific personality traits, which is called “cancer personality”. People who are often in a state of stress, anxiety and depression are at high risk of cancer, and young people are the ones who are exposed to this psychological state for a long time, which also stimulates the occurrence of cancer from the side. In conclusion, the occurrence of cancer is the result of the joint action of self and environmental factors, and the rejuvenation of cancer is the final product of the action of many factors such as environment and society. Preventive measures 1. Change bad habits and establish a healthy lifestyle. These include quitting smoking, avoiding alcohol, having a balanced diet, living regularly, and being clean. 2. Try to stay away from carcinogenic substances, such as using environmentally friendly materials in home decoration, and paying attention to protection in production and labor if they come into contact with carcinogenic substances, etc. 3. Relax your body and mind properly and have a good psychological quality. We should pay attention to communication with others, release bad emotions in time, be open-minded and generous. 4.Regular physical examination and early diagnosis and treatment. Regular physical examination is very useful to detect early cancer and should be strongly advocated. In addition, health education should be strengthened, such as women’s own breast examination, which is very helpful to detect early breast cancer.