<<Disclaimer: Verify this information before applying it to your situation.>> I have also recently found I have blood in the stool. My Internal Med Doc said this is common for people with Celiac and/or malabsorption syndromes. Since I had a sigmoidoscopy performed 2 years ago with negative results, he said not to worry about it. I've never had a colonoscopy performed, and am wondering if I should pursue this any further, or, except his medical advice. He is not up on the current Celiac info. I am 35 years old, and other than being anaemic and having low magnesium levels; despite supplementation, I am in good health. Could one of the Docs please comment on causes for this, if this is common for Celiacs, and if it warrants further investigation. Your comments are appreciated. Colleen.