As long as the colonoscopy shows only congestion, there is no erosion or ulceration, usually there is no fecal occult blood. It cannot be ruled out that when the congested area is irritated by food or when the infection is aggravated, the congestive pressure will increase and the congestion will rupture and bleed, and then there will be fecal occult blood.
Fecal occult blood is a laboratory test that detects a small amount of bleeding in the digestive tract. When colonoscopy shows only congestion without erosions or ulcers, there is usually no accompanying hemorrhage, and the red blood cells have not been destroyed, so there will be no fecal occult blood.
Enteroscopy shows that intestinal congestion and intestinal infection, intussusception and other reasons related to the intestinal system when the intestinal system by bacteria, viruses, pathogens after the infection, pathogenic bacteria on the intestinal mucosa caused by stimulation, which in turn manifested in the presence of intestinal mucosa congestion, edema phenomenon, due to the absence of erosions and ulceration, usually does not lead to intestinal bleeding, so in the fecal occult blood test will not show positive results.
If there is persistent congestion, serious infection, or food irritation after eating that leads to ulceration and bleeding, there will be fecal occult blood when doing stool routine.
When the above symptoms occur, it is recommended to go to the hospital in time and follow the doctor’s instructions to prescribe the appropriate tests according to their own conditions in order to determine the specific situation.