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Living with Cooks syndrome

A rare genetic condition with missing or small nails and short fingertip bones, often with unusual thumbs.

Understanding Cooks syndrome

Cooks syndrome is a rare genetic condition in which the tips of the fingers and toes, including nails and end bones, are missing or underdeveloped.

More than half of the fingers and toes are usually affected. The thumbs may look like fingers. It is present from birth.

Signs & symptoms

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

  • Small or missing toenails
  • Poorly formed fingernails
  • Short fingers or toes (brachydactyly)
  • Broad thumb
  • Finger-like thumb (triphalangeal thumb)
  • Split hand

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 bone and joint specialists, genetic specialists and skin, hair, and nail specialists.

  3. Ask which tests can help

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

  4. Connect with expert centers

    National Foundation for Ectodermal Dysplasias may keep lists of experts for this condition.

Care & treatment

Care team
Bone and joint specialists (orthopedists or orthopedic surgeons); Genetic specialists (geneticists); Skin, hair, and nail specialists (dermatologists)
Expert care
Expert lists: National Foundation for Ectodermal Dysplasias
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 National Foundation for Ectodermal Dysplasias 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
Which gene is involved, and would genetic testing help our family?
How might this affect hand use, and are there therapies or surgery?
What is the chance that my children will have it?

Quick facts

Symptoms usually startNewborn
InheritanceAutosomal Dominant

GARD says changes in genes cause this condition. It is autosomal dominant, meaning one changed copy of the gene can be enough to cause it. GARD doesn't name a gene.

GeneticSkin

Also known as: anonychia-onychodystrophy with hypoplasia or absence of distal phalanges syndrome; odp

Patient organizations

Source: NIH GARD · Cooks syndromeGARD ID 4083 · 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 Cooks syndrome.

Explore the Cooks syndrome blog

Explore research for Cooks syndrome

Explore actively recruiting Cooks syndrome studies with HealthSpark.

HealthSpark

Find actively recruiting studies for Cooks 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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