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Attention deficit hyperactivity disorder (ADHD) is a mental health disorder that can cause above-normal levels of hyperactive and impulsive behaviors. People with ADHD may also have trouble focusing their attention on a single task or sitting still for long periods of time.

Both adults and children can have ADHD. It’s a diagnosis the American Psychiatric Association (APA) recognizes. Learn about types of ADHD and symptoms in both children and adults.

A wide range of behaviors are associated with ADHD. Some of the more common ones include:

  • having trouble focusing or concentrating on tasks
  • being forgetful about completing tasks
  • being easily distracted
  • having difficulty sitting still
  • interrupting people while they’re talking

If you or your child has ADHD, you may have some or all of these symptoms. The symptoms you have depend on the type of ADHD you have. Explore a list of ADHD symptoms common in children.

To make ADHD diagnoses more consistent, the APA has grouped the condition into three categories, or types. These types are predominantly inattentive, predominantly hyperactivity-impulsive, and a combination of both.

Predominantly inattentive

As the name suggests, people with this type of ADHD have extreme difficulty focusing, finishing tasks, and following instructions.

Experts also think that many children with the inattentive type of ADHD may not receive a proper diagnosis because they don’t tend to disrupt the classroom. This type is most common among girls with ADHD.

Predominantly hyperactive-impulsive type

People with this type of ADHD show primarily hyperactive and impulsive behavior. This can include fidgeting, interrupting people while they’re talking, and not being able to wait their turn.

Although inattention is less of a concern with this type of ADHD, people with predominantly hyperactive-impulsive ADHD may still find it difficult to focus on tasks.

Combined hyperactive-impulsive and inattentive type

This is the most common type of ADHD. People with this combined type of ADHD display both inattentive and hyperactive symptoms. These include an inability to pay attention, a tendency toward impulsiveness, and above-normal levels of activity and energy.

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The type of ADHD you or your child has will determine how it’s treated. The type you have can change over time, so your treatment may change, too. Learn more about the three types of ADHD.

You may have heard the terms “ADD” and “ADHD” and wondered what the difference is between them.

ADD, or attention deficit disorder, is an outdated term. It was previously used to describe people who have problems paying attention but aren’t hyperactive. The type of ADHD called predominantly inattentive is now used in place of ADD.

ADHD is the current overarching name of the condition. The term ADHD became official in May 2013, when the APA released the Diagnostic and Statistical Manual of Mental Disorders, Fifth Edition (DSM-5).

This manual is what doctors refer to when making diagnoses for mental health conditions. Get a better understanding of the difference between ADD and ADHD.

One in 10 children between ages 5 to 17 years receives an ADHD diagnosis, making this one of the most common childhood neurodevelopmental disorders in the United States.

For children, ADHD is generally associated with problems at school. Children with ADHD often have trouble succeeding in a controlled classroom setting.

Boys are more than twice as likely as girls to receive an ADHD diagnosis. This may be because boys tend to exhibit hallmark symptoms of hyperactivity. Although some girls with ADHD may have the classic symptoms of hyperactivity, many don’t. In many cases, girls with ADHD may:

  • daydream frequently
  • be hyper-talkative rather than hyperactive

Many symptoms of ADHD can be typical childhood behaviors, so it can be hard to know what’s ADHD-related and what’s not. Learn more about how to recognize ADHD in toddlers.

Despite how common ADHD is, doctors and researchers still aren’t sure what causes the condition. It’s believed to have neurological origins. Genetics may also play a role.

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Research suggests that a reduction in dopamine is a factor in ADHD. Dopamine is a chemical in the brain that helps move signals from one nerve to another. It plays a role in triggering emotional responses and movements.

Other research suggests a structural difference in the brain. Findings indicate that people with ADHD have less gray matter volume. Gray matter includes the brain areas that help with:

  • speech
  • self-control
  • decision-making
  • muscle control

Researchers are still studying potential causes of ADHD, such as smoking during pregnancy. Find out more about the potential causes and risk factors of ADHD.

There’s no single test that can tell if you or your child has ADHD. A recent study highlighted the benefits of a new test to diagnose adult ADHD, but many clinicians believe an ADHD diagnosis can’t be made based on one test.

To make a diagnosis, your doctor will assess any symptoms you or your child has had over the previous six months.

Your doctor will likely gather information from teachers or family members and may use checklists and rating scales to review symptoms. They’ll also do a physical exam to check for other health problems. Learn more about ADHD rating scales and what they can and cannot do.

If you suspect that you or your child has ADHD, talk to your doctor about getting an evaluation. For your child, you can also talk to their school counselor. Schools regularly…

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