Three kinds of porridge to prevent cancer, there is no scientific basis, it is recommended not to gullibly believe. Cancer prevention measures are mainly divided into primary prevention and secondary prevention. 1. Primary prevention: the prevention of the causes of cancer refers to the various intervention activities to prevent cancer from occurring through the implementation of reducing the population’s exposure to cancer risk factors. (1) Strengthen health education on cancer prevention, especially for people at high risk of cancer, to improve their knowledge of cancer and self-care ability. Maintain a good mental state, healthy dietary life and exercise habits, and improve one’s ability to fight cancer. (2) Reasonable use of medical supplies, do not abuse drugs and radiation, especially diagnostic irradiation of women during pregnancy, in order to prevent leukemia, osteosarcoma, skin cancer and so on. (3) Eliminate occupational carcinogenic factors and strengthen the detection, control and elimination of substances that have been confirmed to cause tumors in order to prevent the occurrence of occupational tumors. (4) Strengthen labor protection, environmental protection and food hygiene to reduce or eliminate carcinogenic factors in the environment. 2. Secondary prevention: (1) Monitoring of asymptomatic people, monitoring of breast cancer: promote breast self-examination, and those with history of ovarian disease and endometritis should pay special attention when screening. Surveillance of cervical cancer: all women who are sexually active are at risk of cervical cancer. Surveillance of colon and rectal cancer, especially those with family history of tumor, family history of polyp, polyp ulcer and colorectal cancer need to pay attention. (2) Monitoring of symptomatic people. Since more than 75% of malignant tumors suffered by human body occur in parts of the body that are easy to detect and easy to find, paying attention to the cancer signals of common malignant tumors and timely initiative to go to the hospital for checkup are conducive to early detection, early diagnosis and early treatment of malignant tumors.