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Living with 9p13 microdeletion syndrome

A rare chromosome condition that can bring mild developmental delay, hand tremors, ADHD, and a social personality.

Understanding 9p13 microdeletion syndrome

9p13 microdeletion syndrome is a rare chromosome condition caused by a missing piece of the short arm of chromosome 9.

It brings mild to moderate developmental delay, hand tremors, myoclonic jerks (quick muscle twitches), ADHD, and a social personality. People also have teeth grinding (bruxism), short stature, and minor facial differences. GARD lists onset as the newborn and infant period.

Signs & symptoms

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

  • Mild global developmental delay
  • Attention deficit (ADHD)
  • Hand tremor
  • Muscle twitches (myoclonus)
  • Teeth grinding (bruxism)
  • Short stature

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 and genetic specialists.

  3. Ask which tests can help

    Your care team will decide which exams and tests can confirm the diagnosis.

Care & treatment

Care team
Brain and nervous system specialists (neurologists); 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 Chromosome Disorder Outreach
  • 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 my child see a neurologist about tremors and twitches?
What can help with attention and behavior?
Could teeth grinding need dental care?

Quick facts

Symptoms usually startNewborn and as an Infant

GARD says changes in genes (also called variants) cause this condition. The summary describes it as a partial deletion of the short arm of chromosome 9.

GeneticNeurological

Also known as: del(9)(p13); monosomy 9p13

Patient organizations

Broader rare-disease groups

Source: NIH GARD · 9p13 microdeletion syndromeGARD ID 21437 · 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 9p13 microdeletion syndrome.

Explore the 9p13 microdeletion syndrome blog

Explore research for 9p13 microdeletion syndrome

Explore actively recruiting 9p13 microdeletion syndrome studies with HealthSpark.

HealthSpark

Find actively recruiting studies for 9p13 microdeletion 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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