Do i need to worry if i have runny stomach, passing bloody mucus stools?

Doctor can evaluate: Colon or rectum symptoms with bloody mucus can be due to irritation (inflammation) or infection. Symptoms can occur from infectious viruses or bacteria, inflammatory bowel, Giardia infections, celiac disease, etc... Lactose intolerance, or eating excess fruits or sugarfree sweeteners like maltitol, can cause gas and nonbloody diarrhea. A primary care doctor, or a gastroenterologist, can evaluate.