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White mucus with stool is normal?

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white mucus in stool normal or when to worry

A small amount of mucus in stool is normal. A larger amount, or mucus that keeps showing up, is not.
Why mucus is there
Your large intestine makes mucus all the time. It lubricates the stool and protects the bowel wall. Guyton and Hall describe it as a barrier that stops acids formed in the feces from attacking the intestinal wall (Guyton and Hall Textbook of Medical Physiology, section on secretion of mucus by the large intestine). So a little mucus, usually clear or whitish and often unnoticed, is expected.
When it is more likely normal
  • The amount is small and only occasional.
  • You have no pain, bleeding, fever, weight loss, or change in bowel habit.
  • You have had a recent mild stomach bug or constipation.
When it is not normal
S Das's Manual on Clinical Surgery lists slimy stools from excess mucus as often due to large bowel disorder. It lists purulent stools as a sign of severe dysentery or ulcerative colitis (S Das A Manual on Clinical Surgery, "Faeces").
The Mayo Clinic and Cleveland Clinic say the same thing. A small amount is usually fine. A noticeable increase, or mucus that is regular, white or yellowish, or bloody, is worth checking.
Common causes of increased white mucus:
  • Irritable bowel syndrome. White mucus is a common symptom.
  • Gastrointestinal infection (bacterial, viral, or parasitic).
  • Constipation or diarrhea.
  • Ulcerative colitis, Crohn's disease, or proctitis.
  • Food intolerance, anal fissure, or fistula.
  • Rarely, colorectal tumors, especially villous adenoma.
See a doctor if you have any of these
  • Blood in the stool, or black or tarry stool.
  • Persistent or increasing mucus.
  • Abdominal pain, fever, or diarrhea that lasts.
  • Alternating diarrhea and constipation.
  • Unexplained weight loss.
  • Being over 45 to 50 with a new change in bowel habit.
  • A child who passes mucus with blood or has frequent loose stools.
Two points to keep separate
  • White mucus in the stool is not the same as white or clay-colored stool. White stool means a lack of bile, which can point to a bile duct blockage or liver disease. It needs prompt evaluation.
  • In infants, small amounts of mucus are common with teething, drooling, or a mild cold. Blood or mucus with frequent loose stools needs medical review.
If you tell me your age, how long it has been happening, and any other symptoms, I can help work out how worried to be. This is general information, not a diagnosis.
A quick PubMed search for recent systematic reviews on this topic found nothing that changes this advice.
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