Ulcerative Colitis: Symptoms And Treatments

9. Bloody Diarrhea

The presence of bloody diarrhea and mucus is an indication of a flare, or when the disease becomes active. Infected or inflamed ulcers located on the lining of the colon cause extreme irritation and disruption to the digestive process. Food that enters the gastrointestinal tract during a flare further irritates the inflamed intestines, causing diarrhea. Avoiding inflammatory foods such as dairy, wheat, gluten, fatty meats, and grains while a flare is present may reduce the amount of bloody diarrhea.