Bleeding in the stool is something that happens to almost all of us, sometimes bright red, sometimes dark red, sometimes tarry (commonly known as black stool), sometimes with a tearing pain, sometimes without any pain. Although blood in stool is not a disease, it is not as simple as we usually think. The condition that causes bloody stools may be hemorrhoids, rectal cancer or some other diseases, so how exactly should we distinguish between them? Do I need to consider the possibility of rectal cancer if I bleed after every bowel movement? Blood is discharged from the anus and stools that are bright red, dark red or tarry (black) in color are called blood in stools. Blood in stool is only a symptom, not a disease. Bleeding from any part of the digestive tract can cause blood in stool. For example, the mouth, biliary tract, gastrointestinal tract and anus. Blood in stool is mostly seen in lower gastrointestinal bleeding, especially bleeding from colon and rectal lesions, but also in upper gastrointestinal bleeding. When the stool is black or bright red, it is considered to be a case of blood in stool, and the following causes should be ruled out: 1. Oral intake of certain herbs and charcoal, iron, button, when the stool is black. 2, eating too much meat, pig liver, animal blood or spinach, the stool is black. 3.Bright red stools after taking phenolphthalein preparations orally. What are the causes of blood in stool? 1, anal fissure; 2, internal hemorrhoids; 3, rectal polyps or colon polyps; 4, rectal cancer, colon cancer; 5, gastrointestinal bleeding; 6, blood in stool of bacterial dysentery; 7, blood in stool of non-specific ulcerative colitis. Do I need to consider the possibility of rectal cancer if I bleed after every bowel movement? Colorectal cancer, also known as colorectal cancer, includes colon cancer and rectal cancer and is a common malignant tumor. Most colorectal cancers are already in the middle to late stage when diagnosed, and the treatment effect is not good. However, if it can be detected and treated in the early stage, most colorectal cancers can be cured, and the 5-year survival rate can be as high as 90%, while the 5-year survival rate of advanced colorectal cancers is less than 10%, so it is very important to detect colorectal cancers in the early stage and prevent them as early as possible. The last few inches of the large intestine are called the rectum. Common symptoms of rectal cancer include: 1. changes in bowel habits, such as diarrhea, constipation, or increased frequency of bowel movements; 2. dark or reddish blood in the stool; 3. mucus in the stool; 4. abdominal pain; 5. painful bowel movements; 6. iron-deficiency anemia; 7. a feeling that you can’t always empty your bowels completely; 8. unexplained weight loss; 9. weakness or fatigue. If you have symptoms of rectal cancer, especially blood in feces or unexplained weight loss, you should go to the hospital for examination. Endoscopy is the mainstay of early diagnosis of colorectal cancer. Screening helps early detection, diagnosis and treatment of colorectal cancer, and is an important means of preventing colorectal cancer and reducing the death rate. The death rate of colorectal cancer in western countries has been declining in recent years because of early detection and treatment of early colorectal cancer and its precancerous lesions through screening. The U.S. Preventive Services Task Force recommends colorectal cancer screening for people between the ages of 50 and 75, and some people over the age of 75 also need to be screened. Universal screening and screening is an effective way to detect early-stage cancer, and there is a possibility of colorectal cancer after middle age. The American Cancer Society (ACS) suggests that people over the age of 40 go to the anorectal department of the hospital for rectal fingerprinting once a year, and those over the age of 50 should also be examined for fecal occult blood every year, and undergo colonoscopy once every five years. For high-risk groups, the age of routine examination should be advanced by 10 years, and strive for annual colonoscopy.