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Living with Nonsyndromic congenital nail disorder 1

A genetic condition affecting the fingernails and toenails, with thick nails that lift away from the nail bed and look claw-like.

Understanding Nonsyndromic congenital nail disorder 1

Nonsyndromic congenital nail disorder 1 is a genetic condition that affects the fingernails and toenails.

Nails are extremely thick (onychauxis), may lift off the nail bed (onycholysis), and can look claw-like. Some fingers and toes may be missing part of the nail. Nails are often abnormal from birth but may not be noticed until later in childhood because they grow slowly. GARD says people have no other health problems related to the condition.

Signs & symptoms

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

  • Poorly formed fingernails (nail dysplasia)
  • Brittle nails
  • Grooved or ridged nails
  • Nail pits
  • Spoon-shaped nails
  • Thin nails

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 and skin, hair, and nail specialists.

  3. Consider genetic testing

    Changes in FZD6 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); 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
Are there ways to care for the nails and reduce pain or catching?
Would FZD6 genetic testing be useful for me or my family?
Could this affect other family members?

Quick facts

Symptoms usually startChild
InheritanceAutosomal Dominant
GenesFZD6

Changes in the FZD6 gene cause this condition. It is inherited in an autosomal dominant way, meaning one changed copy of the gene can be enough.

GeneticSkin

Also known as: claw-shaped nails; fzd6 inherited isolated nail anomaly; idiopathic trachyonychia; inherited isolated nail anomaly caused by mutation in fzd6; nail disorder, nonsyndromic congenital, 10; nail disorder, nonsyndromic congenital, type 10

Patient organizations

Broader rare-disease groups

Source: NIH GARD · Nonsyndromic congenital nail disorder 1GARD ID 10363 · GARD page updated September 2026 · Plain-language summary by Know Rare; editorial review pending. General information, not medical advice.

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