Cancer prevention is currently divided into three levels Primary prevention: adopting effective measures to reduce or eliminate the carcinogenic effects of various carcinogenic factors on the human body, treating pre-cancerous lesions and reducing the incidence of cancer. Secondary prevention: Using the methods of primary screening and early diagnosis to detect early cancer patients, so that they can receive early treatment, achieve good efficacy and reduce cancer mortality. Tertiary prevention: When treating cancer patients, we try to prevent cancer recurrence and metastasis, and prevent complications and sequelae. Cancer prevention measures are to establish a good lifestyle, choose foods with few or no cancer-causing factors, adjust the diet structure scientifically and reasonably, etc. If you can do so, you can reduce the risk of cancer by half. (1) Actively treat pre-cancerous lesions, which is effective in preventing the occurrence of cancer. (2) Maintain good emotions. You should actively overcome sadness, anxiety, pain and impatience in life, and do your best to increase joy in life and work, less sorrow and more dash. Learn to openly express their emotions, develop a broad-minded, unconcerned about things character. (3) Change the habit of smoking and drink less alcohol can reduce the incidence of cancer, especially lung cancer. (4) Change bad habits, such as eating less pickles, eating more fresh vegetables and fruits, not eating moldy and smoked food, eating and drinking not very hot and hard, not too fast, and eating less stimulating food. (5) advocate late marriage, birth control, pay attention to women’s health, and actively treat women’s diseases. Promote breastfeeding yourself, breastfeeding period to about a year is appropriate. (6) Carry out mass census and general treatment, vigorously carry out investigation and research, in order to understand the causes of the disease, explore the law of occurrence of cancer, and further develop simple, easy to implement and effective preventive measures. (7) Do a good job in the treatment of three wastes, protect environmental health, prevent environmental pollution, investigate and properly deal with carcinogenic substances. Among cancer patients, about 90% of the occurrence is related to environmental factors. (8) People engaged in occupations related to cancer should strictly abide by the operation procedures, strengthen personal protection, minimize the contact time and quantity with carcinogenic substances, and do a good job in regular physical examination. (9) Promote the development of physical activities to enhance physical fitness and improve the ability to resist cancer. (10) Low-fat food should be chosen. (11) Anti-mold. How to detect cancer at an early stage Insist on annual physical examination Alarm signs of cancer (1) Change in urinary and fecal habits. This may be an early sign of malignant tumors such as colon cancer and liver cancer. (2) Unusual bleeding or secretion. For example, blood in the nose in nasopharyngeal cancer, bloody vaginal discharge in cervical cancer, or hematuria in the urinary system. (3) Lumps in the breast or other parts of the body. It is worth emphasizing the importance of painless lumps in particular. (4) Indigestion or difficulty in swallowing. This is a time to be especially alert for stomach and esophageal cancers (which are often misdiagnosed). (5) Annoying cough or hoarseness. If there is blood in the sputum when coughing (for example, Ma Ah Qiao), you need to pay attention to the possibility of lung cancer. In addition to lung cancer, hoarseness can also occur in laryngeal cancer. (6) Significant changes in warts or moles. This indicates the possibility of malignant transformation. (7) More than pain. Bone metastasis, pancreatic cancer, intestinal cancer and other types of diseases.