Short answer · Medically reviewed summary · Last updated: 2023-07-13

Smith Magenis Syndrome (SMS) is a rare genetic disorder characterized by a variety of physical, cognitive, and behavioral features. It is estimated to affect approximately 1 in 15,000 to 25,000 individuals worldwide, making it a relatively uncommon condition. The syndrome is caused by a deletion or mutation in a specific region of chromosome 17, which leads to the disruption of normal development and functioning of various body systems.

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What is the prevalence of Smith Magenis Syndrome?

Prevalence of Smith Magenis Syndrome: how many people are affected worldwide, differences by sex and region, with sources.

Prevalence of Smith Magenis Syndrome

Smith Magenis Syndrome (SMS) is a rare genetic disorder characterized by a variety of physical, cognitive, and behavioral features. It is estimated to affect approximately 1 in 15,000 to 25,000 individuals worldwide, making it a relatively uncommon condition.


The syndrome is caused by a deletion or mutation in a specific region of chromosome 17, which leads to the disruption of normal development and functioning of various body systems. Individuals with SMS typically exhibit distinctive facial features, intellectual disability, delayed speech and language development, sleep disturbances, and behavioral issues such as self-injurious behaviors and aggression.


While the prevalence of SMS may vary across different populations, it is generally considered to be a rare disorder. Due to its rarity, diagnosis and awareness of SMS can be challenging, leading to potential underdiagnosis or misdiagnosis. Early identification and intervention are crucial in managing the symptoms and providing appropriate support for individuals with SMS and their families.


Author: DiseaseMaps Editorial Team
Reviewed against authoritative medical sources (NIH GARD, Orphanet, OMIM)
Last updated: 2023-07-13
Medical disclaimer: This information does not substitute professional medical advice. Always consult your doctor before making health decisions.
Source: DiseaseMaps.org
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