What Is ADHD?

By The Understood Team
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ADHD is a common condition that makes it hard to focus, keep still, and think before acting. Some people with ADHD mainly have trouble with focus. (This is also known as ADD.) ADHD can also impact other skills, including managing emotions.

Snapshot: What ADHD Is

ADHD is a common condition that’s caused by differences in the brain. People with ADHD have trouble with focus. But some are also hyperactive and impulsive. That’s especially true with kids and teens. 

It’s not clear exactly how many people in the United States have ADHD. But estimates are between 5 and 11 percent.

People with ADHD have trouble with a group of key skills known as executive function. And that creates challenges in many areas of life, from school to work to everyday living. For example, people with ADHD often struggle to get organized, follow directions, and manage their emotions.

ADHD isn’t a matter of laziness or willpower—that’s one of many myths about it. In fact, people with ADHD are often trying as hard as they can to focus and keep their impulses in check.

For a long time, people thought ADHD was something only kids—boys, in particular—had. But research shows that adults also struggle with ADHD, and that women and girls have it as often as men and boys.

ADHD doesn’t just go away as people get older. Most of the time, hyperactivity and impulsivity lessen or disappear by the teen years or a little longer. But trouble with focus usually continues. Some people aren’t diagnosed with ADHD until after high school or as adults.

No matter when people are diagnosed with ADHD, there are treatments that can make symptoms more manageable. And there are supports that can make things easier at school and at work.

Dive Deeper

ADHD Signs and Symptoms

The main symptoms of ADHD are trouble with focus, impulsivity, and hyperactivity. People can have them to varying degrees, and not everyone has all three. Symptoms can change, and some might go away with age.

The stereotype of kids with ADHD is that they’re always in motion, they’re impulsive and hyperactive, and that they act out at home and at school. But some people with ADHD never have those symptoms. They only struggle with focus. ADD is one name for this type of ADHD.

People with ADHD have trouble with executive function, which is the “management system” of the brain. Because of that, people with ADHD often struggle with:

  • Managing time

  • Getting and staying organized

  • Setting priorities

  • Planning

  • Managing emotions

  • Paying attention and remembering things

  • Shifting focus from one thing to another

  • Getting started on and finishing tasks

  • Thinking before saying or doing things

There’s one confusing sign of ADHD. People who have trouble focusing most of the time can often “hyperfocus” on tasks or activities they find really interesting.

For instance, a child might focus for hours while doing a craft project but drift off five minutes after starting homework. Or an adult may hyperfocus on video games or a TV show, to the point that they don’t hear their name being called.

Signs of ADHD can pop up at any age. Kids can show signs as young as preschool. But many don’t show signs until later on, as school gets harder and they have more to juggle. Some people don’t realize that what they experience is ADHD until they’re in college or working.

Dive Deeper

Possible Causes of ADHD

There’s been a lot of research in the last few years pointing to possible causes of ADHD. Brain imaging studies have found differences and similarities in people with and without ADHD.

The research shows that brain development is very similar. But the areas involved in executive function take longer to develop in people with ADHD. That’s why kids with ADHD may act one to three years younger than other kids their age. Research also shows some differences in how the brain functions.

These differences have nothing to do with intelligence. People with ADHD are just as smart as people who don’t have it.

Researchers are also looking at the role of genetics. ADHD tends to run in families. A child with ADHD has a one in four chance of having at least one parent who has it. And there’s a strong likelihood that another close family member also has ADHD.

Read a dad’s candid story about moving past the guilt of “giving” his son ADHD.

Dive Deeper

How ADHD Is Diagnosed

There are no tests for ADHD. Instead, evaluators use a variety of tools to determine if a child has ADHD. One is a questionnaire about behavior. Another is a clinical interview.

Here are some types of professionals who may diagnose ADHD:

  • General health-care providers, including pediatricians

  • Psychiatrists

  • Developmental pediatricians

  • Neuropsychologists

  • Psychiatric nurse practitioners

  • Clinical psychologists

Watch as an expert explains the process for diagnosing ADHD.

Dive Deeper

How ADHD Is Treated

There are a few types of treatment for ADHD. They include:

Medication: Experts agree that this is the most effective way to treat ADHD in most kids and adults. There are two main types of medication for ADHD: stimulant and non-stimulant. Learn more about ADHD medication.

Behavior therapy: This type of therapy involves creating a rewards system for changing a child’s behavior. It’s different from cognitive behavioral therapy (CBT), which helps people look at their thoughts, emotions, and behaviors, and make positive changes. CBT may be helpful to some people with ADHD, but it’s not a treatment for ADHD.

Alternative treatments: There’s no shortage of companies that claim to have an all-natural fix to ADHD. Most have no evidence to back up their claims. Learn more about alternative treatments for ADHD.

ADHD doesn’t go away. But with the right treatments and supports in school, at home, and at work, people with ADHD can thrive.

Dive Deeper

For parents and caregivers: Does your child have trouble with focus, hyperactivity, or impulsivity, or has your child been diagnosed with ADHD?

For educators: Do you have a student who struggles with attention, or who has accommodations for ADHD?

Do you think you might have ADHD?

Understood is not affiliated with any pharmaceutical company.

Key Takeaways

  • ADHD is a biological condition that can impact focus, organization, and self-control.

  • ADHD is not a problem of laziness or willpower.

  • With the right support, people with ADHD can thrive.

About the Author

About the Author

The Understood Team 

is made up of passionate writers, editors, and community moderators. Many of them learn and think differently, or have kids who do.

Reviewed by

Reviewed by

Thomas E. Brown, PhD 

is a clinical psychologist and clinical associate professor of psychiatry at the Keck School of Medicine of USC.

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