Skip to content
knowrare
HealthSignal
Your condition community

Living with Thyroid agenesis

A condition present at birth in which the thyroid gland is completely missing, leading to low thyroid hormone.

Understanding Thyroid agenesis

Thyroid agenesis is a rare condition in which the thyroid gland is completely absent from birth, causing lifelong low thyroid hormone (congenital hypothyroidism).

Without thyroid hormone, a baby can have feeding trouble, constipation, tiredness, low muscle tone, slow growth, and developmental delay. Signs usually appear in the newborn period or infancy.

Signs & symptoms

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

  • Feeding difficulties
  • Constipation
  • Tiredness (fatigue and lethargy)
  • Low muscle tone (hypotonia)
  • Global developmental delay and slow growth
  • Long-lasting yellowing of the skin in a newborn (jaundice)

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
What thyroid tests and scans confirm this diagnosis?
How is the thyroid hormone level monitored over time?
Which specialists, such as an endocrinologist, should we see?

Quick facts

Symptoms usually startNewborn and as an Infant
InheritanceAutosomal Dominant

GARD says changes in genes (variants) cause this condition and that it is autosomal dominant, so one changed copy of a gene can be enough. It doesn't name a specific gene.

GeneticEndocrine

Also known as: athyreosis; athyroidal hypothyroidism; congenital absence of thyroid gland; congenital thyroid aplasia

Patient organizations

Rare-disease groups that can help

Source: NIH GARD · Thyroid agenesisGARD ID 16842 · 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 Thyroid agenesis.

Explore the Thyroid agenesis blog

Explore research for Thyroid agenesis

Explore actively recruiting Thyroid agenesis studies with HealthSpark.

HealthSpark

Find actively recruiting studies for Thyroid agenesis 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

Powered by HealthSpark, our AI chat helper

I can help you find recruiting Thyroid agenesis studies. Enter a ZIP code, address or city below and I'll look within 50 miles.

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

Get Signals for Thyroid agenesis

Stay in the loop with community stories and updates from medical researchers.

HealthStoryfor Thyroid agenesis

Create a living journal that talks back

HealthStory evolves private journaling with a living AI journal that talks back and asks thoughtful questions, helping you capture your Thyroid agenesis experiences more deeply and prepare for better conversations with your doctors and care team.

Start your journal

Your journal is private. Sharing your story publicly is a separate choice, made with Share your story above.