Attention deficit hyperactivity disorder (ADHD) is a chronic developmental disorder characterized by attention problems, including distractibility, hyperactivity, impulsive behaviors, and the inability to remain focused on tasks or activities. Among its acronyms are AD/HD and ADD. Diagnosed in childhood, the disorder can continue into adulthood. (Gale Encyclopedia of Mental Health, 3rd edition)

DSM-V Classification:

• Combined Presentation 314.01
• Predominately inattentive presentation 314.00
• Predominately hyperactive/impulsive presentation 314.01

ICD-10 Classification:

• Combined Presentation F90.2
• Predominately inattentive presentation F90.0
• Predominately hyperactive/impulsive presentation F.90.1

According to the Diagnostic and statistical manual of mental disorders:

• ADHD occurs in most cultures in about 5% of children and about 2.5% of adults.
• ADHD is more frequent in males, with a ratio of approximately 2:1 in children and 1.6:1 in adults