As the name suggests, fecal occult blood is relative to blood stool. If there is more blood in the stool, which is visible to the naked eye, then we call it blood stool, and if there is less blood in the stool (meandering is often less than sml), which is not visible to the naked eye, we call it fecal occult blood. However, this fecal occult blood is relative again, and now doctors can find traces of this small amount of bleeding with the help of a microscope with magnification function, helping people to detect some diseases early, such as stomach cancer. So, is a positive fecal occult blood test also one of the early signs of colorectal cancer? This question begins with an event experienced by a famous person. When Reagan was re-elected as president in 1984, there were objections on the grounds that Reagan’s fecal occult blood test was often positive and there might be problems in the gastrointestinal tract. 1985, after Reagan’s successful re-election, he found that the fecal occult blood phenomenon had worsened and was found to have multiple polyps and cancerous lesions in the colon by colonoscopy, after which he underwent colon cancer resection. A second operation was performed after colonoscopy revealed recurrence of polyps. The simple fecal occult blood test enabled the former U.S. president to detect colorectal cancer and precancerous lesions at an early stage and to remove the lesions as soon as possible, thus avoiding serious consequences. Thus, a positive fecal occult blood test is an important early sign of colorectal cancer. This is because in colorectal cancer, the cancerous tissues often have a small amount of bleeding due to erosion, which can be excreted with the stool. Why can the occult blood test detect hidden bleeding? It turns out that red blood cells are running in the intact vascular network, when tumor bleeds, they flow into the intestine and mix with the stool, red blood cells contain a very vigorous peroxidase, in the presence of hydrogen peroxide, even a very small amount of the enzyme (a very small amount of red blood cells, 50g of stool mixed with 5 drops of blood can be detected by this method) can oxidize the colorless reagent to blue oxide, so it is very easy to This is the principle of the fecal occult blood test. This is the principle of the fecal occult blood test. The occult blood test can indicate early colorectal cancer and can detect patients with no or minimal symptoms. The fewer the symptoms of colorectal cancer, the more limited the tumor is and the less chance of metastasis, but the consequent problem is that the less symptoms, the less patients will go for examination, and the fecal occult blood test can solve this problem. Some scholars examined 5017 patients over 40 years old with this method and found 13 cases of colorectal cancer, among which 61.2% of the earlier cancers could be completely removed, which undoubtedly improved the prognosis of patients greatly. If there is more blood in the stool, which is visible to the naked eye, we call it bloody stool, and if there is less blood in the stool (meandering is often less than sml), which is not visible to the naked eye, we call it fecal occult blood. However, this fecal occult blood is relative again, and now doctors can find traces of this small amount of bleeding with the help of a microscope with magnification function, helping people to detect some diseases early, such as stomach cancer. So, is a positive fecal occult blood test also one of the early signs of colorectal cancer? This question begins with an event experienced by a famous person. When Reagan was re-elected as president in 1984, there were objections on the grounds that Reagan’s fecal occult blood test was often positive and there might be problems in the gastrointestinal tract. 1985, after Reagan’s successful re-election, he found that the fecal occult blood phenomenon had worsened and was found to have multiple polyps and cancerous lesions in the colon by colonoscopy, after which he underwent colon cancer resection. A second operation was performed after colonoscopy revealed recurrence of polyps. The simple fecal occult blood test enabled the former U.S. president to detect colorectal cancer and precancerous lesions at an early stage and to remove the lesions as soon as possible, thus avoiding serious consequences. Thus, a positive fecal occult blood test is an important early sign of colorectal cancer. This is because in colorectal cancer, the cancerous tissues often have a small amount of bleeding due to erosion, which can be excreted with the stool. Why can the occult blood test detect hidden bleeding? It turns out that red blood cells are running in the intact vascular network, when tumor bleeds, they flow into the intestine and mix with the stool, red blood cells contain a very vigorous peroxidase, in the presence of hydrogen peroxide, even a very small amount of the enzyme (a very small amount of red blood cells, 50g of stool mixed with 5 drops of blood can be detected by this method) can oxidize the colorless reagent to blue oxide, so it is very easy to This is the principle of the fecal occult blood test. This is the principle of the fecal occult blood test. The occult blood test can indicate early colorectal cancer and can detect patients with no or minimal symptoms. The fewer the symptoms of colorectal cancer, the more limited the tumor is and the less chance of metastasis, but the consequent problem is that the less symptoms, the less patients will go for examination, and the fecal occult blood test can solve this problem. Some scholars examined 5017 patients over 40 years old with this method and found 13 cases of colorectal cancer, among which 61.2% of the earlier cancers could be completely removed, which undoubtedly improved the prognosis of patients.