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Living with Thyroid hypoplasia

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

Understanding Thyroid hypoplasia

Thyroid hypoplasia is a condition in which the thyroid gland does not fully develop, causing lasting low thyroid hormone from birth (congenital hypothyroidism).

Signs usually appear in the newborn period or infancy. They can include tiredness, constipation, a swollen belly, a large tongue, jaundice, and slow growth and development.

Signs & symptoms

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

  • Tiredness (fatigue)
  • Constipation
  • Large tongue (macroglossia)
  • Low muscle tone (hypotonia)
  • Growth delay and short stature
  • Global developmental delay

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 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: hypoplasia of thyroid; hypoplastic thyroid; small thyroid gland

Patient organizations

Rare-disease groups that can help

Source: NIH GARD · Thyroid hypoplasiaGARD ID 8426 · 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 hypoplasia.

Explore the Thyroid hypoplasia blog

Explore research for Thyroid hypoplasia

Explore actively recruiting Thyroid hypoplasia studies with HealthSpark.

HealthSpark

Find actively recruiting studies for Thyroid hypoplasia 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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