Weak positive fecal occult blood, other normal, many causes, not necessarily cancer, can also be seen in a variety of diseases caused by upper gastrointestinal bleeding, other intestinal diseases, etc. 1. Upper gastrointestinal bleeding: such as damage to the esophagus, stomach and duodenum caused by foreign bodies, damage to the gastric mucosa caused by aspirin, anti-inflammatory pain, glucocorticoids and other drugs, gastric polyps, duodenal diverticulum, bile ducts or gallbladder stones, biliary ascariasis, gastric and duodenal ulcers, etc., causing upper gastrointestinal bleeding, and weakly positive fecal occult blood can occur. 2. Gastrointestinal cancer: gastric cancer, liver cancer, colon cancer and other gastrointestinal cancers can show weak positive fecal occult blood when there is a small amount of bleeding. 3. Other intestinal diseases: intestinal tuberculosis, ulcerative conjunctivitis, colon polyps, hookworm disease, etc. can show weak positive fecal occult blood. If there is a weak positive fecal occult blood, it is necessary for the physician to assess the individual’s condition and other relevant examinations, and then treat the patient reasonably.