Smith-Magenis Syndrome Fact 2

Although the exact incidence is not known, it is estimated that SMS occurs in 1 out of 25,000 births, however the actual prevalence may be closer to 1 in 15,000 births. SMS is vastly under-diagnosed. Recent data indicates that there are approximately 600 known cases world-wide. But as awareness of it increases, the number of people identified grows every year.