There are 3 kinds of Attention Deficit Hyperactivity Disorder (ADHD):
- Predominantly Inattentive Presentation: Individuals have difficulty paying attention to detail or following instructions. They find it hard to organize or complete tasks, and are easily distracted and forgetful.
- Predominantly Hyperactive Impulsive Presentation: Individuals have a hard time remaining still for prolonged periods of time, often fidget, and can be very talkative. Persons who exhibit this kind of presentation of ADHD can be very impulsive, frequently feel restless, and may interrupt others while they are speaking or have a hard time waiting to take turns.
- Combined Presentation: Both kinds of the previously mentioned presentations are represented equally in these individuals.

Causes:
While significant research has been conducted to identify some risk factors related to the disorder, the actual cause of ADHD has yet to be discovered. However, research has shown that genetics play an important role.

ADHD Throughout the Years:
Although the presence of ADHD has existed as early as 1902 (based on the discovery of its symptoms by Sir George Still), the number of people diagnosed with ADHD has risen dramatically over the past several decades. In 2003 there was a 7.8% increase in diagnosis. In 2007, it rose to 9.5%. And in 2011, it increased by 11%.

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(Percent of Youth Aged 4-17 with Current Attention-Deficit/Hyperactivity Disorder by State: National Survey of Children's Health – 2011)

Approximately 3 to 10% of children are diagnosed with ADHD; 60% of those children will have symptoms that continue to affect them into adulthood.

The diagnosis of ADHD is on the rise, but in 2011 research showed that as many as 17.5% of the population who suffer with ADHD are not being treated for the disorder.
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Adult ADHD:
Adult ADHD is far less common (roughly 4-5%) but has become more prevalent over the years. As many as 8 million adults are affected with ADHD worldwide.

Treatment:
According to a study conducted in 2007, it is estimated that Americans spend $42.5 billion dollars (about $14,576 per person) each year on ADHD-related expenses.
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Webibliography:

http://www.cdc.gov/ncbddd/adhd/data.html
http://www.webmd.com/add-adhd/guide/adhd-adults
http://www.healthline.com/health/adhd/facts-statistics-infographic#5

By Stephanie Brody
9 February, 2015