Carcinoembryonic antigen is an antigen in our body, and if it is elevated, it mostly indicates the presence of cancer in the body. Therefore, we should pay attention to high carcinoembryonic antigen. High carcinoembryonic antigen (CEA) is first found in colon cancer and fetal intestinal tissues, hence the name carcinoembryonic antigen. 97% of healthy adults have a serum CEA concentration of 2.5 ng/mI or less, and elevated CEA is commonly found in colorectal cancer, pancreatic cancer, gastric cancer, small cell lung cancer, breast cancer, medullary thyroid cancer, etc. CEA above 20 ng/ml is often indicative of gastrointestinal tumors. Other diseases such as pregnancy and cardiovascular disease, diabetes, non-specific colitis, etc. can also be seen to have elevated carcinoembryonic antigen. Carcinoembryonic antigen (CEA) greater than 10 mg/ml only indicates the possibility of malignant tumor. Carcinoembryonic antigen is a protein synthesized in the gastrointestinal tract, liver and pancreas during embryonic life. It is also synthesized in small amounts in the gastrointestinal tract of adults, but it does not enter the blood system but is excreted through the gastrointestinal tract; therefore, there are only trace amounts of carcinoembryonic antigen in the serum of normal adults. Carcinoembryonic antigen is a protein that is synthesized in the gastrointestinal tract, liver and pancreas during embryonic life. In the case of gastrointestinal tumors, the serum carcinoembryonic antigen will be significantly elevated, and a serum carcinoembryonic antigen of more than 20 micrograms per liter of blood indicates the presence of gastrointestinal tumors. However, other malignant tumors such as lung cancer, pancreatic cancer, breast cancer, and some benign diseases such as non-specific colitis, collagenous diseases, and cardiovascular diseases are also elevated. A positive carcinoembryonic antigen does not necessarily mean cancer. Some gastrointestinal diseases may also cause a positive carcinoembryonic antigen, and some normal people may occasionally have a slightly higher level. In order to be cautious, it is recommended to continue to review the carcinoembryonic antigen and to exclude the possibility of tumor if it continues to rise. Of course, simply put, it is a test that can be used as a reference to diagnose whether or not you have an individual type of cancer. Special attention is given to the fact that it is only a reference. It cannot be used as a final diagnosis. How to prevent cancer? 1. Strict weight control According to the survey of World Health Organization, compared with 20 years ago, the average weight of Chinese people has increased about 40% and the incidence of cancer has increased 9 times. These two sets of data fully prove that obesity is the main reason for the increase of cancer incidence in China. 2. Don’t eat moldy food The World Health Organization survey found that most Chinese people have the habit of frugality. They often do not bother to throw away the food that has become moldy, but heat them up and eat them. Moldy food contains a large amount of aflatoxin, because this harmful substance can not remove the toxin inside even if it is fully heated, which is very likely to lead to the appearance of liver cancer if eaten often. Chinese people love to eat smoked, pickled, baked, fried and overheated food, which is the main reason why the incidence of stomach disease and esophageal cancer in China is the first in the world. Such foods mainly include smoked fish, roasted meat, bacon, salted vegetables and hot pot. 4.Wash fresh fruits and vegetables before eating them The survey found that China is the world’s largest country in terms of pesticide use. This can easily lead to pesticides on fruits and vegetables entering their bodies, thus inducing cancers such as intestinal cancer, liver cancer and brain tumors. 5.No alcohol and no smoking The survey found that the consumption of liquor and tobacco in China is the first in the world. Alcoholism and smoking are the main causes of stomach cancer, liver cancer, pancreatic cancer, lung cancer, intestinal cancer, breast cancer, endometrial cancer and many other cancers.