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Health library/Smith-Magenis syndrome

Rare developmental disorders / RARE CONDITION

Smith-Magenis syndrome

Also known as: 17p- syndrome, 17p11.2 monosomy, Chromosome 17p deletion syndrome, Deletion 17p syndrome, Partial monosomy 17p, SMS

Smith-Magenis syndrome affects learning, behavior and sleep regulation. Communication and daily support needs vary from person to person.

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What you may notice

Symptoms can overlap with other conditions and vary between people.

  • Developmental or language delay
  • Sleep disturbance
  • Behavioral difficulties
  • Distinctive facial features

Understanding care

Clinical care may include genetic assessment and coordinated sleep, communication and behavioral support. A qualified clinician decides which investigations and options fit the individual situation.

When to seek help

Arrange specialist assessment for growth, feeding or developmental concerns. Breathing difficulty, loss of responsiveness or new seizures requires urgent care rather than a community review.

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.

Smith-Magenis syndrome — First AID health library