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Living with Smith-Magenis syndrome

A genetic condition that affects behavior, sleep and learning, with distinctive facial features.

Understanding Smith-Magenis syndrome

Smith-Magenis syndrome is a developmental disorder that affects behavior, emotions and learning.

Major features include distinctive facial features, sleep problems, behavior problems, mild to moderate intellectual disability, and delayed speech. People often have trouble falling asleep, wake often at night and are sleepy in the day. They tend to be affectionate and engaging, and may also have tantrums, aggression, anxiety and self-injury. Short stature, scoliosis, obesity and a hoarse voice can occur.

Signs & symptoms

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

  • Sleep problems
  • Mild to moderate intellectual disability
  • Delayed speech and language
  • Tantrums, anxiety and attention problems
  • Broad, square face
  • Short stature and scoliosis

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 brain and nervous system specialists, genetic specialists and hormone specialists.

  3. Consider genetic testing

    Changes in RAI1 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

    Parents and Researchers Interested in Smith-Magenis Syndrome (PRISMS) may keep lists of experts for this condition.

Care & treatment

Care team
Brain and nervous system specialists (neurologists); Genetic specialists (geneticists); Hormone specialists (endocrinologists)
Expert care
Expert lists: Parents and Researchers Interested in Smith-Magenis Syndrome (PRISMS)
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 Parents and Researchers Interested in Smith-Magenis Syndrome (PRISMS) 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
Can genetic testing of the RAI1 gene confirm this diagnosis?
What can help with sleep and behavior?
Should the heart, kidneys, hearing and eyes be checked?

Quick facts

Symptoms usually starta variety of ages
InheritanceAutosomal Dominant
GenesRAI1

GARD lists changes in the RAI1 gene. It is inherited in an autosomal dominant pattern, meaning one changed copy of the gene is enough.

GeneticNeurologicalEndocrine

Also known as: 17p11.2 microdeletion syndrome; chromosome 17p11.2 deletion syndrome; smith magenis syndrome; smith-magenis syndrome, isolated cases; sms

Patient organizations

Source: NIH GARD · Smith-Magenis syndromeGARD ID 8197 · 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 Smith-Magenis syndrome.

Explore the Smith-Magenis syndrome blog

Explore research for Smith-Magenis syndrome

Explore actively recruiting Smith-Magenis syndrome studies with HealthSpark.

HealthSpark

Find actively recruiting studies for Smith-Magenis 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

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

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