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Attention Deficit Hyperactivity Disorder

Attention Deficit Hyperactivity Disorder (ADHD) is a condition that becomes apparent in some children in the
preschool and early school years. It is hard for these children to control their behavior and/or pay attention. It is
estimated that between 3 and 5 percent of children have ADHD, or approximately 2 million children in the United
States.  This means that in a classroom of 25 to 30 children, it is likely that at least one will have ADHD. Because ADHD
often continues into adulthood, this website contains a section on the diagnosis and treatment of ADHD in adults.


The principal characteristics of ADHD are inattention, hyperactivity, and impulsivity. These symptoms appear
early in a child's life. Because many normal children may have these symptoms, but at a low level, or the symptoms
may be caused by another disorder, it is important that the child receive a thorough examination and appropriate
diagnosis by a well-qualified professional.

Symptoms of ADHD will appear over the course of many months, often with the symptoms of impulsiveness and
hyperactivity preceding those of inattention, which may not emerge for a year or more. A child who "can't sit still" or
is otherwise disruptive will be noticeable in school, but the inattentive daydreamer may be overlooked. The impulsive
child who acts before thinking may be considered just a "discipline problem," while the child who is passive or
sluggish may be viewed as merely unmotivated. Yet both may have different types of ADHD. When the child's hyperactivity, distractibility, poor concentration, or impulsivity begin to affect performance in school, social relationships with other
children, or behavior at home, ADHD may be suspected. But because the symptoms vary so much across settings,
ADHD is not easy to diagnose.

According to the most recent version of the Diagnostic and Statistical Manual of Mental Disorders (DSM-IV-TR), there
are three patterns of behavior that indicate ADHD. There are three subtypes of ADHD recognized by professionals.
These are the predominantly hyperactive-impulsive type (that does not show significant inattention); the
predominantly inattentive type (that does not show significant hyperactive-impulsive behavior) sometimes called
ADD—an outdated term for this entire disorder; and the combined type (that displays both inattentive and
hyperactive-impulsive symptoms).


Hyperactive children always seem to be "on the go" or constantly in motion. They dash around touching or playing
with whatever is in sight, or talk incessantly. Sitting still at dinner or during a school lesson or story can be a difficult
task. They squirm and fidget in their seats or roam around the room. Or they may wiggle their feet, touch everything,
or noisily tap their pencil. Hyperactive teenagers or adults may feel internally restless. They often report needing to
stay busy and may try to do several things at once.

Impulsive children seem unable to curb their immediate reactions or think before they act. They will often blurt out
inappropriate comments, display their emotions without restraint, and act without regard for the later consequences
of their conduct. Their impulsivity may make it hard for them to wait for things they want or to take their turn in games.
They may grab a toy from another child or hit when they're upset. Even as teenagers or adults, they may impulsively
choose to do things that have an immediate but small payoff rather than engage in activities that may take more
effort yet provide much greater but delayed rewards.

Some signs of hyperactivity-impulsivity are:

Feeling restless, often fidgeting with hands or feet, or squirming while seated

Running, climbing, or leaving a seat in situations where sitting or quiet behavior is expected

Blurting out answers before hearing the whole question

Having difficulty waiting in line or taking turns.


Children who are inattentive have a hard time keeping their minds on any one thing and may get bored with a task
after only a few minutes. If they are doing something they really enjoy, they have no trouble paying attention. But
focusing deliberate, conscious attention to organizing and completing a task or learning something new is difficult.

Homework is particularly hard for these children. They will forget to write down an assignment, or leave it at school.
They will forget to bring a book home, or bring the wrong one. The homework, if finally finished, is full of errors and
erasures. Homework is often accompanied by frustration for both parent and child.

The DSM-IV-TR gives these signs of inattention:

Often becoming easily distracted by irrelevant sights and sounds

Often failing to pay attention to details and making careless mistakes

Rarely following instructions carefully and completely losing or forgetting things like toys, or pencils, books, and tools
needed for a task

Often skipping from one uncompleted activity to another.

Children diagnosed with the Predominantly Inattentive Type of ADHD are seldom impulsive or hyperactive, yet they
have significant problems paying attention. They appear to be daydreaming, "spacey," easily confused, slow moving,
and lethargic. When the teacher gives oral or even written instructions, this child has a hard time understanding
what he or she is supposed to do and makes frequent mistakes. Yet the child may sit quietly, unobtrusively, and even
appear to be working but not fully attending to or understanding the task and the instructions.

This is an edited version of the revised Attention Deficit Hyperactivity Disorder, a National Institute of Mental Health
(NIMH) brochure first printed in 1994 and reprinted in 1996. The revision is by Margaret Strock, staff member in the
Office of Communications, NIMH. All material in this document is in the public domain and may be reproduced or
copied without permission from the NIMH.  

ADHD in Children

ADHD in Adults

Adult ADHD:  50 Tips of Management

ADHD Symptoms

Diagnosis and Causes of ADHD

Related Websites

Recommended Reading

Your Teenager with ADHD



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In case of emergency, please call 911 or your local hospital emergency service.

This content was last modified on: 09/25/2015

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