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Living with Isolated congenital hypogonadotropic hypogonadism

A rare genetic hormone condition in which the body makes too little of the hormones that start puberty and support fertility.

Understanding Isolated congenital hypogonadotropic hypogonadism

Isolated congenital hypogonadotropic hypogonadism is a rare genetic pituitary hormone condition with low sex hormone levels.

The pituitary gland does not make enough of the hormones FSH and LH (gonadotropins), so sex hormone levels are low. Some people have a normal sense of smell. Others have a reduced sense of smell, which is called Kallmann syndrome. It can be found at a variety of ages. It involves the hormone system and the reproductive system.

Signs & symptoms

GARD doesn't list specific symptoms for this condition yet. Its summary describes these features:

  • Low levels of FSH and LH hormones
  • Low sex hormone levels
  • Normal or reduced sense of smell

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, hormone specialists, maternal-fetal medicine specialists and urinary and male reproductive system 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

    Resolve: The National Infertility Association and Pituitary Network Association may keep lists of experts for this condition.

Care & treatment

Care team
Genetic specialists (geneticists); Hormone specialists (endocrinologists); Maternal-fetal medicine specialists (pregnancy-related); Urinary and male reproductive system specialists (urologists)
Expert care
Expert lists: Resolve: The National Infertility Association, Pituitary Network Association
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 Resolve: The National Infertility Association 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
Do I have a normal sense of smell or Kallmann syndrome?
Can genetic testing find the gene involved?
What are the options for puberty and fertility?

Quick facts

Symptoms usually starta variety of ages
InheritanceAutosomal Dominant, Autosomal Recessive, X-Linked

Changes in genes cause this condition. GARD lists autosomal dominant, autosomal recessive, and X-linked inheritance, so it can be passed down in different ways.

GeneticEndocrineUrinary and Reproductive

Also known as: idiopathic hypogonadotropic hypogonadism; isolated congenital gonadotropin deficiency; isolated gonadotropin-releasing hormone deficiency; nonsyndromic congenital hypogonadotropic hypogonadism

Patient organizations

Source: NIH GARD · Isolated congenital hypogonadotropic hypogonadismGARD ID 20643 · GARD page updated September 2026 · Plain-language summary by Know Rare; editorial review pending. General information, not medical advice.

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