Irritable bowel syndrome, ulcerative colitis and inflammatory bowel disease are causes of mucus in stool. Other causes include Chrohn's disease, bowel obstruction and anal fissures, states About.com.Continue Reading
A minimal amount of mucus in the stool is normal. The intestines produce mucus in order to keep the intestines lubricated. Mucus that occurs in large amounts or over a long period of time that is accompanied by symptoms of stomach pain, diarrhea and bloody mucus could indicate Chrohn's disease, ulcerative colitis or cancer, according to Mayo Clinic.
Bacterial infections such as salmonella and Shigella cause fever and stomach cramps in addition to mucus in the stool, while bowel obstruction has symptoms of vomiting, constipation and cramps, says About.com.Learn more about Pain & Symptoms