What is ADHD?
Attention-deficit/hyperactivity disorder (ADHD) is marked by an ongoing pattern of inattention and/or hyperactivity-impulsivity that interferes with functioning or development. People with ADHD experience an ongoing pattern of the following types of symptoms:
- Inattention means a person may have difficulty staying on task, sustaining focus, and staying organized, and these problems are not due to defiance or lack of comprehension.
- Hyperactivity means a person may seem to move about constantly, including in situations when it is not appropriate, or excessively fidgets, taps, or talks. In adults, hyperactivity may mean extreme restlessness or talking too much.
- Impulsivity means a person may act without thinking or have difficulty with self-control. Impulsivity could also include a desire for immediate rewards or the inability to delay gratification. An impulsive person may interrupt others or make important decisions without considering long-term consequences.
What are the signs and symptoms of ADHD?
Some people with ADHD mainly have symptoms of inattention. Others mostly have symptoms of hyperactivity-impulsivity. Some people have both types of symptoms.
Many people experience some inattention, unfocused motor activity, and impulsivity, but for people with ADHD, these behaviors:
- Are more severe
- Occur more often
- Interfere with or reduce the quality of how they function socially, at school, or in a job
People with symptoms of inattention may often:
- Overlook or miss details and make seemingly careless mistakes in schoolwork, at work, or during other activities
- Have difficulty sustaining attention during play or tasks, such as conversations, lectures, or lengthy reading
- Not seem to listen when spoken to directly
- Find it hard to follow through on instructions or finish schoolwork, chores, or duties in the workplace, or may start tasks but lose focus and get easily sidetracked
- Have difficulty organizing tasks and activities, doing tasks in sequence, keeping materials and belongings in order, managing time, and meeting deadlines
- Avoid tasks that require sustained mental effort, such as homework, or for teens and older adults, preparing reports, completing forms, or reviewing lengthy papers
- Lose things necessary for tasks or activities, such as school supplies, pencils, books, tools, wallets, keys, paperwork, eyeglasses, and cell phones
- Be easily distracted by unrelated thoughts or stimuli
- Be forgetful in daily activities, such as chores, errands, returning calls, and keeping appointments
People with symptoms of hyperactivity-impulsivity may often:
- Fidget and squirm while seated
- Leave their seats in situations when staying seated is expected, such as in the classroom or the office
- Run, dash around, or climb at inappropriate times or, in teens and adults, often feel restless
- Be unable to play or engage in hobbies quietly
- Be constantly in motion or on the go, or act as if driven by a motor
- Talk excessively
- Answer questions before they are fully asked, finish other people’s sentences, or speak without waiting for a turn in a conversation
- Have difficulty waiting one’s turn
- Interrupt or intrude on others, for example in conversations, games, or activities
Primary care providers sometimes diagnose and treat ADHD. They may also refer individuals to a mental health professional, such as a psychiatrist or clinical psychologist, who can do a thorough evaluation and make an ADHD diagnosis.
For a person to receive a diagnosis of ADHD, the symptoms of inattention and/or hyperactivity-impulsivity must be chronic or long-lasting, impair the person’s functioning, and cause the person to fall behind typical development for their age. Stress, sleep disorders, anxiety, depression, and other physical conditions or illnesses can cause similar symptoms to those of ADHD. Therefore, a thorough evaluation is necessary to determine the cause of the symptoms.
Most children with ADHD receive a diagnosis during the elementary school years. For an adolescent or adult to receive a diagnosis of ADHD, the symptoms need to have been present before age 12.
ADHD symptoms can appear as early as between the ages of 3 and 6 and can continue through adolescence and adulthood. Symptoms of ADHD can be mistaken for emotional or disciplinary problems or missed entirely in children who primarily have symptoms of inattention, leading to a delay in diagnosis. Adults with undiagnosed ADHD may have a history of poor academic performance, problems at work, or difficult or failed relationships.
ADHD symptoms can change over time as a person ages. In young children with ADHD, hyperactivity-impulsivity is the most predominant symptom. As a child reaches elementary school, the symptom of inattention may become more prominent and cause the child to struggle academically. In adolescence, hyperactivity seems to lessen and symptoms may more likely include feelings of restlessness or fidgeting, but inattention and impulsivity may remain. Many adolescents with ADHD also struggle with relationships and antisocial behaviors. Inattention, restlessness, and impulsivity tend to persist into adulthood.
What are the risk factors of ADHD?
Researchers are not sure what causes ADHD, although many studies suggest that genes play a large role. Like many other disorders, ADHD probably results from a combination of factors. In addition to genetics, researchers are looking at possible environmental factors that might raise the risk of developing ADHD and are studying how brain injuries, nutrition, and social environments might play a role in ADHD.
ADHD is more common in males than females, and females with ADHD are more likely to primarily have inattention symptoms. People with ADHD often have other conditions, such as learning disabilities, anxiety disorder, conduct disorder, depression, and substance use disorder.
How is ADHD treated?
While there is no cure for ADHD, currently available treatments may reduce symptoms and improve functioning. Treatments include medication, psychotherapy, education or training, or a combination of treatments.
For many people, ADHD medications reduce hyperactivity and impulsivity and improve their ability to focus, work, and learn. Sometimes several different medications or dosages must be tried before finding the right one that works for a particular person. Anyone taking medications must be monitored closely by their prescribing doctor.
Stimulants. The most common type of medication used for treating ADHD is called a “stimulant.” Although it may seem unusual to treat ADHD with a medication that is considered a stimulant, it works by increasing the brain chemicals dopamine and norepinephrine, which play essential roles in thinking and attention.
Under medical supervision, stimulant medications are considered safe. However, like all medications, they can have side effects, especially when misused or taken in excess of the prescribed dose, and require an individual’s health care provider to monitor how they may be reacting to the medication.
Non-stimulants. A few other ADHD medications are non-stimulants. These medications take longer to start working than stimulants, but can also improve focus, attention, and impulsivity in a person with ADHD. Doctors may prescribe a non-stimulant: when a person has bothersome side effects from stimulants, when a stimulant was not effective, or in combination with a stimulant to increase effectiveness.
Although not approved by the U.S. Food and Drug Administration (FDA) specifically for the treatment of ADHD, some antidepressants are used alone or in combination with a stimulant to treat ADHD. Antidepressants may help all of the symptoms of ADHD and can be prescribed if a patient has bothersome side effects from stimulants. Antidepressants can be helpful in combination with stimulants if a patient also has another condition, such as an anxiety disorder, depression, or another mood disorder. Non-stimulant ADHD medications and antidepressants may also have side effects.
Doctors and patients can work together to find the best medication, dose, or medication combination. To find the latest information about medications, talk to a health care provider and visit the FDA website .
Psychotherapy and psychosocial interventions
Several specific psychosocial interventions have been shown to help individuals with ADHD and their families manage symptoms and improve everyday functioning.
For school-age children, frustration, blame, and anger may have built up within a family before a child is diagnosed. Parents and children may need specialized help to overcome negative feelings. Mental health professionals can educate parents about ADHD and how it affects a family. They also will help the child and his or her parents develop new skills, attitudes, and ways of relating to each other.
All types of therapy for children and teens with ADHD require parents to play an active role. Psychotherapy that includes only individual treatment sessions with the child (without parent involvement) is not effective for managing ADHD symptoms and behavior. This type of treatment is more likely to be effective for treating symptoms of anxiety or depression that may occur along with ADHD.
Behavioral therapy is a type of psychotherapy that aims to help a person change their behavior. It might involve practical assistance, such as help organizing tasks or completing schoolwork, or working through emotionally difficult events. Behavioral therapy also teaches a person how to:
- Monitor their own behavior
- Give oneself praise or rewards for acting in a desired way, such as controlling anger or thinking before acting
Parents, teachers, and family members also can give feedback on certain behaviors and help establish clear rules, chore lists, and structured routines to help a person control their behavior. Therapists may also teach children social skills, such as how to wait their turn, share toys, ask for help, or respond to teasing. Learning to read facial expressions and the tone of voice in others, and how to respond appropriately can also be part of social skills training.
Cognitive behavioral therapy helps a person learn how to be aware and accepting of one’s own thoughts and feelings to improve focus and concentration. The therapist also encourages the person with ADHD to adjust to the life changes that come with treatment, such as thinking before acting, or resisting the urge to take unnecessary risks.
Family and marital therapy can help family members and spouses find productive ways to handle disruptive behaviors, encourage behavior changes, and improve interactions with the person with ADHD.
Parenting skills training (behavioral parent management training) teaches parents skills for encouraging and rewarding positive behaviors in their children. Parents are taught to use a system of rewards and consequences to change a child’s behavior, to give immediate and positive feedback for behaviors they want to encourage, and to ignore or redirect behaviors they want to discourage.
Specific behavioral classroom management interventions and/or academic accommodations for children and teens have been shown to be effective for managing symptoms and improving functioning at school and with peers. Interventions may include behavior management plans or teaching organizational or study skills. Accommodations may include preferential seating in the classroom, reduced classwork load, or extended time on tests and exams. The school may provide accommodations through what is called a 504 Plan or, for children who qualify for special education services, an Individualized Education Plan (IEP).
To learn more about the Individuals with Disabilities Education Act (IDEA), visit the U.S. Department of Education’s IDEA website .
Stress management techniques can benefit parents of children with ADHD by increasing their ability to deal with frustration so that they can respond calmly to their child’s behavior.
Support groups can help parents and families connect with others who have similar problems and concerns. Groups often meet regularly to share frustrations and successes, to exchange information about recommended specialists and strategies, and to talk with experts.
The National Resource Center on ADHD, a program of Children and Adults with Attention-Deficit/Hyperactivity Disorder (CHADD®) supported by the Centers for Disease Control and Prevention (CDC), has information and many resources. You can reach this center online or by phone at 1-866-200-8098.
Learn more about psychotherapy.
Tips to help kids and adults with ADHD stay organized
Parents and teachers can help kids with ADHD stay organized and follow directions with tools such as:
- Keeping a routine and a schedule. Keep the same routine every day, from wake-up time to bedtime. Include times for homework, outdoor play, and indoor activities. Keep the schedule on the refrigerator or a bulletin board. Write changes on the schedule as far in advance as possible.
- Organizing everyday items. Have a place for everything, (such as clothing, backpacks, and toys), and keep everything in its place.
- Using homework and notebook organizers. Use organizers for school material and supplies. Stress to your child the importance of writing down assignments and bringing home necessary books.
- Being clear and consistent. Children with ADHD need consistent rules they can understand and follow.
- Giving praise or rewards when rules are followed. Children with ADHD often receive and expect criticism. Look for good behavior and praise it.
A professional counselor or therapist can help an adult with ADHD learn how to organize their life with tools such as:
- Keeping routines.
- Making lists for different tasks and activities.
- Using a calendar for scheduling events.
- Using reminder notes.
- Assigning a special place for keys, bills, and paperwork.
- Breaking down large tasks into more manageable, smaller steps so that completing each part of the task provides a sense of accomplishment.
How can I find a clinical trial for ADHD?
Clinical trials are research studies that look at new ways to prevent, detect, or treat diseases and conditions. The goal of clinical trials is to determine if a new test or treatment works and is safe. Although individuals may benefit from being part of a clinical trial, participants should be aware that the primary purpose of a clinical trial is to gain new scientific knowledge so that others may be better helped in the future.
Researchers at NIMH and around the country conduct many studies with patients and healthy volunteers. We have new and better treatment options today because of what clinical trials uncovered years ago. Be part of tomorrow’s medical breakthroughs. Talk to your health care provider about clinical trials, their benefits and risks, and whether one is right for you.
To learn more or find a study, visit:
- NIMH’s Clinical Trials webpage: Information about participating in clinical trials
- Clinicaltrials.gov: Current Studies on ADHD : List of clinical trials funded by the National Institutes of Health (NIH) being conducted across the country
- Join a Study: Children - ADHD: List of studies being conducted on the NIH Campus in Bethesda, MD
Where can I learn more about ADHD?
Free brochures and shareable resources
- Attention-Deficit/Hyperactivity Disorder in Children and Teens: What You Need to Know: This brochure provides information about attention-deficit/hyperactivity disorder (ADHD) in children and teens including symptoms, how it is diagnosed, causes, treatment options, and helpful resources. Also available en español.
- Attention-Deficit/Hyperactivity Disorder in Adults: What You Need to Know: This brochure provides information about attention-deficit/hyperactivity disorder (ADHD) in adults including symptoms, how ADHD is diagnosed, causes, treatment options, and resources to find help for yourself or someone else. Also available en español.
- Shareable Resources on ADHD: These digital resources, including graphics and messages, can be used to spread the word about ADHD and help promote awareness and education in your community.
- Mental Health Minute: ADHD: Take a mental health minute to learn about ADHD.
- NIMH Expert Discusses Managing ADHD: Learn the signs, symptoms, and treatments of ADHD as well as tips for helping children and adolescents manage ADHD during the pandemic.
- ADHD : CDC offers fact sheets, infographics, and other resources about the signs, symptoms, and treatment of children with ADHD.
- ADHD : (MedlinePlus – also available en español .)
Research and statistics
- Journal Articles : This webpage provides information on references and abstracts from MEDLINE/PubMed (National Library of Medicine).
- ADHD Statistics: This web page provides statistics about the prevalence and treatment of ADHD among children, adolescents, and adults.
Last Reviewed: September 2023
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