Weakly positive fecal occult blood suggests that there is gastrointestinal bleeding, which may be caused by bowel cancer or by other diseases. The risk of bowel cancer is higher if there is a combination of certain risk factors or if certain symptoms are present. All types of colorectal cancer are prone to rupture and bleed causing weakly positive fecal occult blood. Risk factors for colorectal cancer include a long history of inflammatory bowel disease, a previous history of intestinal adenomatous polyps, a family history of colorectal cancer, long-term smoking, and obesity. People with the above risk factors are at higher risk of bowel cancer if they have weakly positive fecal occult blood. The risk of bowel cancer is high if the patient has some related manifestations with weak positive fecal occult blood: long-term chronic abdominal pain, hard and irregular mass on palpation of the abdomen, long-term changes in bowel habit or fecal character, such as constipation, diarrhea, mucus-pus-blood stools, and thinning of stools. When the patient has systemic symptoms such as emaciation, anemia, and fatigue, it often indicates that the cancer is in an advanced stage. For patients with weak positive occult blood in stool and suspected of colorectal cancer, it is recommended to go to the hospital as soon as possible to improve relevant examinations and laboratory tests, such as gastroscopy, colonoscopy, blood tumor index, etc., to clarify the cause of gastrointestinal bleeding and give appropriate treatment as soon as possible.