Smith-Magenis Syndrome

Below you will find more information about Smith-Magenis Syndrome from Medigest. If you believe that you are suffering from any of the symptoms of Smith-Magenis Syndrome it is important that you obtain an accurate diagnosis from a medical professional to ensure that you obtain the correct medication or treatment for your condition. There are medical conditions that carry similar symptoms associated with Smith-Magenis Syndrome and therefore the information provided by Medigest is offered as a guideline only and should never be used in preference to seeking professional medical advice. The information relating to Smith-Magenis Syndrome comes from a third party source and Medigest will not be held liable for any inaccuracies relating to the information shown.


Smith-Magenis syndrome is a unique and clinically identifiable genetic medical condition marked by a specific pattern of physical, behavioral and developmental characteristics and presentations. It is a rare disorder estimated to occur in roughly one out of every 25,000 births.


High resolution chromosome analysis is useful to confirm diagnosis of Smith-Magenis syndrome.


There is no cure for Smith- Magenis syndrome; symptomatic treatment is carried out to help alleviate the existing symptoms. Therapies are also considered as part of improving the condition and controlling some behavioral problems of the child with Smith-Magenis syndrome.

Symptoms and Signs

Common characteristics of a child with Smith-Magenis syndrome include some or all of the following: ò Distinct facial features: short wide head, mid-face hypoplasia, prominent forehead, epicanthal folds, wide nasal bridge, protruding jaw and abnormalities in the ear ò short fingers and toes ò Short stature ò Unusually deep and hoarse voice ò Delayed speech ò Learning disabilities ò Mental retardation ò Hypotonia or poor muscle tone ò Feeding problems in infants ò Eye Irregularities or defects ò Sleep disturbances ò Pain insensitivity ò Behavioral problems which may include: (a) Hyperactivity (b) Head banging (c) Hand or nail biting (d) Skin picking (e) explosive outbursts (f) tantrums (g) destructive and aggressive behavior (h) excitability (i) squeezing the arm when excited


Smith-Magenis syndrome is caused by an irregularity or defect in the short arm of chromosome 17.

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