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What Is ADHD?

Reviewed by Psychology Today Staff

Attention-deficit/hyperactivity disorder (previously known as attention deficit disorder or ADD) is a neurobehavioral disorder characterized by core symptoms of inattentiveness, distractibility, hyperactivity, and impulsivity. ADHD is thought to be the most common childhood mental health disorder, with estimates of its prevalence in children ranging from 5 to 11 percent. ADHD in adulthood is thought to be less common, with approximately 2 to 5 percent of adults diagnosed.

ADHD symptoms can interfere with work, school, household tasks, and relationships, and managing the disorder can be a challenge for both children and adults. Fortunately, there are treatments that have been shown to be effective, and anyone affected by ADHD can learn coping skills to work around struggles and harness their talents-as many successful individuals with ADHD have already done.

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What does ADHD look like?

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Some children and adults with ADHD find it difficult to concentrate on tasks at school or work and may daydream frequently. Children with ADHD may become disruptive, defiant, or have trouble getting along with parents, peers, or teachers. Children who struggle with hyperactivity and impulsivity, in particular, often have behavioral challenges that can be difficult for adults to manage.

Adults, on the other hand, may be more likely to report feeling restless or fidgety; if they struggle with impulsivity, they may make rash decisions that adversely affect their life. For both children and adults, executive functioning (planning, emotional regulation, and decision-making) is often affected as well. Many children and adults display either hyperactive or inattentive symptoms of ADHD, but it’s also possible for both sets of symptoms to exist together, in what is typically called combined type ADHD.

For more on symptoms, see ADHD Symptoms and Diagnosis.

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Is ADHD real?

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Most psychiatrists and psychologists agree that ADHD is real. It runs in families (suggesting genetic roots) and neurological evidence has found it to be associated with alterations in brain growth and development. ADHD is also clearly linked to academic, work, and relationship problems-and responds to treatment-suggesting that it has clinical validity. But whether the disorder is overdiagnosed and overtreated-or whether it reflects a set of evolved traits that have become less adaptive in today’s world-is widely debated.

For more on the biology of ADHD, see Causes and Risk Factors in ADHD.

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