Medically reviewed by Robert Burakoff, MD Key Takeaways Mucus in stool can be a sign of a health issue like irritable bowel syndrome (IBS). Ulcerative colitis can cause mucus in the stool due to ...

When you're sick you'll often produce more phlegm, and might notice it's thicker or a different color: white, green, yellow or maybe even brown. We all produce mucus, even when healthy. Mucus is a ...