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Living with Hereditary neuroendocrine tumor of small intestine

An inherited condition with several slow-growing tumors in the small intestine.

Understanding Hereditary neuroendocrine tumor of small intestine

Hereditary neuroendocrine tumor of the small intestine is a rare inherited condition in which several carcinoid tumors form in the small intestine.

It looks the same as non-inherited carcinoids and can cause belly pain, flushing, and diarrhea, often after a long time with no symptoms. Most people have low-grade tumors. Carcinoids in the lungs have also been reported.

Signs & symptoms

GARD doesn't list specific symptoms for this condition yet. Based on the summary, it can include:

  • Belly pain
  • Flushing of the skin
  • Diarrhea
  • Several tumors in the small intestine

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 cancer specialists, digestive system specialists and genetic specialists.

  3. Consider genetic testing

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

  4. Connect with expert centers

    Neuroendocrine Tumor Research Foundation may keep lists of experts for this condition.

Care & treatment

Care team
Cancer specialists (oncologists); Digestive system specialists (gastroenterologists); Genetic specialists (geneticists)
Expert care
Expert lists: Neuroendocrine Tumor Research Foundation
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 Neuroendocrine Tumor Research Foundation and other patient organizations
  • 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 I have genetic testing for the IPMK gene?
What screening should relatives have?
How often should the intestine be checked for tumors?

Quick facts

InheritanceAutosomal Dominant
GenesIPMK

It is caused by changes in the IPMK gene. It is autosomal dominant, so one changed copy of the gene is enough.

GeneticGastrointestinal

Also known as: hereditary neuroendocrine tumor of small bowel; hereditary neuroendocrine tumor of the small intestine; hereditary neuroendocrine tumour of small bowel; hereditary neuroendocrine tumour of the small intestine; hereditary small intestine neuroendocrine neoplasm

Patient organizations

Source: NIH GARD · Hereditary neuroendocrine tumor of small intestineGARD ID 21899 · GARD page updated September 2026 · Plain-language summary by Know Rare; editorial review pending. General information, not medical advice.

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