Fecal occult blood generally refers to fecal occult blood. Weakly positive fecal occult blood may be related to dietary factors, oral bleeding and gastrointestinal bleeding. 1. Dietary factors: Eating foods such as pig’s blood and duck’s blood may lead to weak positive fecal occult blood. 2. Oral, pharyngeal and nasal bleeding: Suffering from gingivitis, periodontitis, pharyngitis and other diseases can lead to bleeding in the oral cavity, pharynx and nasal cavity. The blood swallowed will pass through the esophagus, stomach and intestines, resulting in weakly positive fecal occult blood. 3. Gastrointestinal bleeding: suffering from acute gastritis, gastric ulcer, esophageal cancer, gastric cancer, inflammatory bowel disease and other diseases, gastrointestinal bleeding can occur, which can also lead to weak positive fecal occult blood. Clinically, there may be other reasons for the weak positive fecal occult blood, and it is recommended to go to the hospital as soon as possible to improve the relevant tests and examinations in order to clarify the cause of the disease.