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Living with Congenital diarrhea 6

A rare inherited bowel condition with long-lasting diarrhea and intestine inflammation starting in infancy.

Understanding Congenital diarrhea 6

Congenital diarrhea 6 is a rare genetic intestinal disease with early, long-lasting diarrhea and intestinal inflammation.

It comes from overactivity of an enzyme called guanylate cyclase 2C. Other features include gas and bloating, dehydration, and changes in blood acid and salt levels. Slow bowel movement, small-bowel blockage, esophagus irritation, irritable bowel syndrome and Crohn's disease are often linked. It starts in newborns and infants.

Signs & symptoms

Symptoms vary from person to person. GARD lists these among the most common:

  • Chronic diarrhea
  • Gas and bloating (meteorism)
  • Dehydration
  • Intestinal inflammation
  • Crohn's disease, in some
  • Abdominal pain, in some

Not everyone has every symptom. GARD's list comes from the Human Phenotype Ontology.

Diagnosis

  1. Talk with your doctor

    Share the symptoms you've noticed, when they started and your family health history. Notes and photos can help.

  2. See a specialist

    Specialists who may be involved include digestive system specialists and genetic specialists.

  3. Consider genetic testing

    Changes in GUCY2C are linked to this condition. Genetic testing and counseling can help confirm a diagnosis and explain what it means for your family.

Care & treatment

Care team
Digestive system specialists (gastroenterologists); Genetic specialists (geneticists)
Expert care
Ask about multidisciplinary care centers for rare conditions
Treatment
GARD doesn't list specific treatments for this condition. Your care team will tailor care to your symptoms.
Research
Clinical trials and observational studies may be options. See the research section below.

General information, not medical advice. Your care team makes the decisions.

Everyday life

Living with a rare condition is easier with support.

  • Connect with Pull-thru Network
  • Keep notes on symptoms, changes and questions for appointments
  • Ask about patient registries that help research
  • Look into financial aid and travel resources for care visits
Bring these questions to your next doctor visit
Should we have genetic testing for the GUCY2C gene?
How can we prevent dehydration and balance salts?
Should I be checked for Crohn's disease?

Quick facts

Symptoms usually startNewborn and as an Infant
InheritanceAutosomal Dominant
GenesGUCY2C

Changes in the GUCY2C gene are listed. It is autosomal dominant, so one changed copy of the gene is enough to cause it.

GeneticGastrointestinal

Also known as: chronic diarrhea due to guanylate cyclase 2c overactivity; chronic diarrhoea due to guanylate cyclase 2c overactivity; chronic infantile diarrhea due to guanylate cyclase 2c overactivity; congenital diarrhea caused by mutation in gucy2c; congenital diarrhea type 6; congenital diarrhoea caused by mutation in gucy2c

Patient organizations

Source: NIH GARD · Congenital diarrhea 6GARD ID 17417 · GARD page updated September 2026 · Plain-language summary by Know Rare; editorial review pending. General information, not medical advice.

You are more than your diagnosis

Perspectives from people navigating life with Congenital diarrhea 6.

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