A new survey released by the Centers for Disease Control and Prevention has found that nearly 1 in 10 American children between the ages of 5 and 17 are currently diagnosed with ADHD, or attention deficit hyperactivity disorder.   

According to the study, the percentage of children ever diagnosed with ADHD increased from 7 percent to 9 percent from 1998 to 2009. The largest increases in cases occurred in children living in the South and Midwest regions of the U.S. The report found a higher incidence of cases among boys, and children living in low-income housing saw an increase in diagnoses of about 10 percent.  

ADHD is one of the most common behavioral problems in children, with symptoms sometimes including difficulty in sustaining attention, impulsive behavior and hyperactivity. The condition often begins in childhood and persists throughout adulthood.

Why the increase? It's still not clear if the increase is due to a growth in cases of ADHD or if there's simply more awareness about the signs and symptoms of the disorder.

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