What are the common causes of mucus in stool? (clear, sometimes yetllow mucus?

Mucus in stool. Small amounts of mucus are normally found in stool. If you have increasingly large amounts of mucus in stool, especially if accompanied by altered bowel habits, blood, pain, fever, nausea, vomting or weight loss, you should go seek medical attention. Possible causes for increased mucus in stool include irritable bowel syndrome, infectious colitis, inflammatory bowel disease, or cancer.