How common is Smith Magenis Syndrome?

By  ,  Onlymyhealth editorial team
Jul 27, 2011

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Quick Bites

  • Smith Magenis Syndorme is a developmental disorder.
  • It affects many parts of the body.
  • It affects at least one person in twenty five thousand individuals worldwide.
  • Many people with Smith Megenis syndrome are not diagnosed.


Smith Magenis Syndorme is a developmental disorder and affects many parts of the body. It mainly causes mild to moderate intellectual disability, delayed speech and language skills, distinctive facial features, sleep disturbances and behavioural problems.

Smith magenis syndrome

Affected people have a broad, square- face and deep set of eyes, the cheeks are fuller with a prominent lower jaw. Apart from these facial features they may also have a flattened nose, and the mouth which tends to turn downward with a full with an outward curved upper lip.  Along with these, dental problems are quite common too.  The facial differences are subtle during the childhood but they usually become distinctive as a child grows into an adult.

Signs and Symptoms

Disrupted sleep is another one of the major characteristics of this disorder. A person with smith magneis may have trouble falling asleep or may feel very sleepy during day time. People having this condition may develop engaging personalities and feel very affectionate about everything but they also go through behavioural problems.  

Such behavioural problems may include:

  • Temper tantrums,
  • sudden outburst
  • Aggression
  • Anxiety
  • Impulsiveness
  • Self injury
  • head banging
  • picking up the skin

impulsive behaviour is common

Some other signs and symptoms of this syndrome include:

  • Short stature
  • abnormal curvature of the spine
  • Reduced sensitivity to pain


How common Is Smith Magenis Syndrome?

This condition affects at least one person in twenty five thousand individuals worldwide.  Many people with Smith Megenis syndrome are not even diagnosed.

Image Courtesy : Getty

Read more article on Understand Smith Magenis Syndrome

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