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Health library/Kallmann syndrome

Rare endocrine disorders / RARE CONDITION

Kallmann syndrome

Also known as: Anosmic hypogonadism, Anosmic idiopathic hypogonadotropic hypogonadism, Hypogonadism with anosmia, Hypogonadotropic hypogonadism and anosmia, Hypogonadotropic hypogonadism-anosmia syndrome, Kallman's syndrome

Kallmann syndrome impairs hormonal signaling needed for puberty. Reduced or absent smell is a characteristic feature that distinguishes it from some other causes of delayed puberty.

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What you may notice

Symptoms can overlap with other conditions and vary between people.

  • Delayed or absent puberty
  • Reduced sense of smell
  • Infertility
  • Genital developmental differences in some people

Understanding care

Clinical care may include endocrine and reproductive assessment with discussion of an individualized hormone plan. A qualified clinician decides which investigations and options fit the individual situation.

When to seek help

Seek specialist review for new or progressive organ-related symptoms. Sudden severe pain, breathing difficulty, confusion or collapse requires urgent assessment.

For severe breathing difficulty, collapse, suspected stroke, or another emergency, call local emergency services immediately. In India, call 112.

Read the medical sources

These sources support the educational article and offer more detail.

Educational reading · Updated 6 October 2026

Prepared from the linked sources. This summary has not had an independent clinician review. A qualified clinician can assess symptoms and explain which information applies to you.

A child and a caring grown-up reading a picture book together

LITTLE PEOPLE. BIG FEELINGS.

It’s okay to have
a lot of questions.

A doctor visit or an unfamiliar health word can feel scary. You can ask a trusted grown-up to help you understand, one small question at a time.

01

Say how you feel.

“I feel worried” is a good place to start.

02

Ask for simple words.

“Can you explain that in a way I understand?”

03

Bring someone you trust.

A caring adult can help you ask and listen.

For children and their grown-ups. This illustration explains a conversation, not a diagnosis. An adult should seek qualified care for a child who is unwell.

Keep reading

Kallmann syndrome — First AID health library