Skip to content
knowrare
HealthSignal
Your condition community

Living with Rabson-Mendenhall syndrome

A rare genetic condition with severe insulin resistance that leads to diabetes, slow growth, and skin and body changes.

Understanding Rabson-Mendenhall syndrome

Rabson-Mendenhall syndrome is a rare disorder with severe insulin resistance, in which the body's tissues don't respond properly to insulin.

This affects blood sugar and eventually leads to diabetes. It also affects growth and development of many parts of the body. People are unusually small starting before birth, and babies don't gain weight as expected. Other early features include little fat under the skin, muscle wasting, dental differences, extra body hair, and thick, dark, velvety skin in body folds (acanthosis nigricans). It is one of the inherited severe insulin resistance syndromes, which also include Donohue syndrome.

Signs & symptoms

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

  • Insulin resistance and diabetes
  • Thick, dark, velvety skin (acanthosis nigricans)
  • Slow growth
  • Extra body hair (hirsutism)
  • Dental crowding and other dental differences
  • Delayed development

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 genetic specialists, hormone specialists and skin, hair, and nail specialists.

  3. Consider genetic testing

    Changes in INSR 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
Genetic specialists (geneticists); Hormone specialists (endocrinologists); Skin, hair, and nail specialists (dermatologists)
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 Children's Skin Disease Foundation
  • 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
Would genetic testing for the INSR gene help our family?
How should blood sugar be managed?
Which specialists, such as an endocrinologist, should be on our care team?

Quick facts

Symptoms usually starta variety of ages
InheritanceAutosomal Recessive
GenesINSR

This condition is caused by changes in the INSR gene. A child inherits a changed copy of the gene from each parent (autosomal recessive).

GeneticEndocrineSkin

Also known as: mendenhall syndrome; pineal hyperplasia and diabetes mellitus syndrome; pineal hyperplasia, insulin-resistant diabetes mellitus and somatic abnormalities; pineal hyperplasia, insulin-resistant diabetes mellitus, and somatic abnormalities

Patient organizations

Broader rare-disease groups

Source: NIH GARD · Rabson-Mendenhall syndromeGARD ID 226 · 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 Rabson-Mendenhall syndrome.

Explore the Rabson-Mendenhall syndrome blog

Explore research for Rabson-Mendenhall syndrome

Explore actively recruiting Rabson-Mendenhall syndrome studies with HealthSpark.

HealthSpark

Find actively recruiting studies for Rabson-Mendenhall syndrome with HealthSpark. Share your city to explore research near you.

  • Recruiting studies from ClinicalTrials.gov
  • Share your city to look for research near you
  • Eligibility is confirmed by the study team

Powered by HealthSpark, our AI chat helper

I can help you find recruiting Rabson-Mendenhall syndrome studies. Enter a ZIP code, address or city below and I'll look within 50 miles.

Powered by HealthSpark, our AI chat helper · Study information from ClinicalTrials.gov · Eligibility is confirmed by the study team.

Get Signals for Rabson-Mendenhall syndrome

Stay in the loop with community stories and updates from medical researchers.

HealthStoryfor Rabson-Mendenhall syndrome

Create a living journal that talks back

HealthStory evolves private journaling with a living AI journal that talks back and asks thoughtful questions, helping you capture your Rabson-Mendenhall syndrome experiences more deeply and prepare for better conversations with your doctors and care team.

Start your journal

Your journal is private. Sharing your story publicly is a separate choice, made with Share your story above.