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Living with Idiopathic congenital hypothyroidism

A condition present from birth in which the thyroid gland doesn't make enough hormone, with no known cause.

Understanding Idiopathic congenital hypothyroidism

Idiopathic congenital hypothyroidism is a type of primary congenital hypothyroidism, an underactive thyroid from birth, whose cause is unknown.

GARD says the cause and how common it is are both unknown. Signs may appear in the newborn period or infancy.

Signs & symptoms

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

  • Feeding difficulties in infancy
  • Constipation
  • Long-lasting newborn jaundice (yellow skin)
  • Umbilical hernia
  • Large soft spot on the back of the head
  • 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 and hormone specialists.

  3. Ask which tests can help

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

Care & treatment

Care team
Genetic specialists (geneticists); Hormone specialists (endocrinologists)
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 rare disease patient organizations for support
  • 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 thyroid tests does my baby need, and how often?
How does thyroid hormone level affect development?
Is genetic testing helpful for our family?

Quick facts

Symptoms usually startNewborn and as an Infant

GARD says changes in genes cause this condition, but the cause is described as unknown. It doesn't list a specific gene.

GeneticEndocrine

Patient organizations

Rare-disease groups that can help

Source: NIH GARD · Idiopathic congenital hypothyroidismGARD ID 19298 · 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 Idiopathic congenital hypothyroidism.

Explore the Idiopathic congenital hypothyroidism blog

Explore research for Idiopathic congenital hypothyroidism

Explore actively recruiting Idiopathic congenital hypothyroidism studies with HealthSpark.

HealthSpark

Find actively recruiting studies for Idiopathic congenital hypothyroidism 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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