ADHD has been called attention-deficit disorder (ADD) and hyperactivity. But ADHD is the preferred term because it describes both primary aspects of the condition: inattention and hyperactive-impulsive behavior.

While many children who have ADHD tend more toward one category than the other, most children have some combination of inattention and hyperactive-impulsive behavior. Signs and symptoms of ADHD become more apparent during activities that require focused mental effort.

In most children diagnosed with ADHD, signs and symptoms appear before the age of 7. In some children, signs of ADHD are noticeable as early as infancy.

Signs and symptoms of inattention may include:

* Often fails to pay close attention to details or makes careless mistakes in schoolwork or other activities
* Often has trouble sustaining attention during tasks or play
* Seems not to listen even when spoken to directly
* Has difficulty following through on instructions and often fails to finish schoolwork, chores or other tasks
* Often has problems organizing tasks or activities
* Avoids or dislikes tasks that require sustained mental effort, such as schoolwork or homework
* Frequently loses needed items, such as books, pencils, toys or tools
* Can be easily distracted
* Often forgetful

Signs and symptoms of hyperactive and impulsive behavior may include:

* Fidgets or squirms frequently
* Often leaves his or her seat in the classroom or in other situations when remaining seated is expected
* Often runs or climbs excessively when it’s not appropriate or, if an adolescent, might constantly feel restless
* Frequently has difficulty playing quietly
* Always seems on the go
* Talks excessively
* Blurts out the answers before questions have been completely asked
* Frequently has difficulty waiting for his or her turn
* Often interrupts or intrudes on others’ conversations or games

ADHD behaviors can be different in boys and girls.

* Boys are more likely to be hyperactive, whereas girls tend to be inattentive.
* Girls who have trouble paying attention often daydream, but inattentive boys are more likely to play or fiddle aimlessly.
* Boys tend to be less compliant with teachers and other adults, so their behavior is often more conspicuous.

Also check out http://www.adhdawareness.com