How can malignant tumors be more effectively prevented and treated? In general, prevention of tumors can be achieved through three levels of prevention. 1. Primary prevention, also known as etiological prevention, is to eliminate or reduce the factors that may cause cancer to prevent the occurrence of cancer. For example, tobacco control, control of hepatitis B, human papillomavirus (HPV), Helicobacter pylori and other infectious sources that can cause cancer, as well as intervention of dietary habits, nutrition and occupational hazards. That is, to promote a healthy lifestyle and reduce cancer-causing factors. One is not to smoke, because smoking can lead to lung cancer, oral cancer, laryngeal cancer, esophageal cancer, etc., which is extremely harmful. Second, not to drink alcohol, excessive alcohol consumption can harm the gastrointestinal tract and liver, leading to stomach and liver cancer. Third, do not eat a high-fat, high-sugar, high-calorie diet and maintain a normal weight. Do not eat moldy and spoiled food, and eat less pickled food. Fourth, try to avoid exposure to the sun to reduce the occurrence of skin cancer. Fifth, we should insist on exercising and maintain optimistic mood. Being healthy and open-minded is very important to prevent tumors. About 75% or more of malignant tumors in the human body occur in parts of the body that are easy to detect and easy to find. Early detection, early diagnosis and early treatment are the keys to improve the cure rate and reduce the mortality rate of cancer. 2. Secondary prevention, also known as preclinical prevention or “three early preventions”, means early detection, early diagnosis, early treatment and other effective means to reduce the death of cancer patients. adults over 40 years old should have annual physical examination. If cancer can be detected, diagnosed and treated early, it has good efficacy and high long-term survival rate, and most patients can be cured. Therefore, timely medical checkup is an effective and economical health investment. 3.Tertiary prevention, also known as clinical prevention or rehabilitative prevention, refers to active and comprehensive treatment for the purpose of prolonging survival and improving quality of life, as well as preventing cancer recurrence and metastasis and preventing complications and sequelae. That is, active medical treatment for diagnosed cancer patients for the best outcome. Even for patients in advanced stages, it can help them to reduce their pain, improve their quality of life and prolong their survival period. One third of cancers can be prevented, one third can be cured, and one third can relieve symptoms and prolong life. Through caring for life and scientific cancer prevention, our life will be better.