ADHD Symptoms in Adults and Kids: The Full DSM-5 Checklist

ADHD symptoms fall into two groups: inattention, such as trouble staying on task or organized, and hyperactivity-impulsivity, such as restlessness, excessive talking and interrupting^[3]. The diagnostic manual used in the U.S., the DSM-5, lists nine symptoms in each group, for 18 in total^[1].

A diagnosis of ADHD requires more than a count of symptoms. They must be present for at least 6 months, several must have appeared before age 12, several must show up in two or more settings, and they must clearly interfere with social, school or work functioning^[1].

Everyone shows some of these behaviors some of the time. In ADHD they are frequent, occur across situations such as school, home and work, and get in the way of daily life^[3].

The symptom mix sorts people into one of three presentations: predominantly inattentive, predominantly hyperactive-impulsive, or combined^[2]. Because symptoms change over time, a person's presentation can change as well^[2].

These are the nine DSM-5 inattention symptoms, paraphrased, and each counts only if it happens often^[1]. The examples in parentheses are the manual's own, including the adult versions^[1].

1. Misses details or makes careless mistakes in schoolwork, at work or in other activities.
2. Has trouble sustaining attention in tasks or play (for example, during lectures, conversations or long reading).
3. Does not seem to listen when spoken to directly; the mind seems elsewhere.
4. Does not follow through on instructions and fails to finish schoolwork, chores or workplace duties.
5. Has difficulty organizing tasks: managing sequential tasks, keeping belongings in order, managing time, meeting deadlines.
6. Avoids or dislikes tasks that need sustained mental effort (homework; for adults, reports, forms and long papers).
7. Loses things needed for tasks, such as school materials, tools, wallets, keys, paperwork, eyeglasses and phones.
8. Is easily distracted by outside stimuli; in older adolescents and adults this may include unrelated thoughts.
9. Is forgetful in daily activities; for adults, returning calls, paying bills and keeping appointments.

The DSM-5 adds that these behaviors must not be solely a result of opposition, defiance, hostility or failure to understand instructions^[1].

The first six items below describe hyperactivity and the last three describe impulsivity. As with inattention, each must happen often and be out of step with the person's developmental level^[1].

1. Fidgets with or taps hands or feet, or squirms in the seat.
2. Leaves their seat when staying seated is expected, in a classroom, office or elsewhere.
3. Runs about or climbs where it is inappropriate; in adolescents and adults this may be limited to feeling restless.
4. Is unable to play or do leisure activities quietly.
5. Is "on the go," as if "driven by a motor," and uncomfortable being still for long, as in restaurants or meetings.
6. Talks excessively.
7. Blurts out answers before a question is finished or completes other people's sentences.
8. Has difficulty waiting their turn, such as in line.
9. Interrupts or intrudes on others' conversations, games or activities, or takes over what others are doing.

The "12 symptoms of ADHD" and "5 main symptoms" lists that circulate online do not match the manual^[1]. The DSM-5 has 18 items, and five is the adult threshold per domain rather than a separate list^[1].

The CDC's list of signs in children includes daydreaming a lot, forgetting or losing things, squirming or fidgeting, talking too much, careless mistakes or unnecessary risks, trouble resisting temptation, trouble taking turns and difficulty getting along with others^[2]. Children with ADHD do not simply grow out of these behaviors; the symptoms continue and can cause problems at school, at home or with friends^[2].

Which symptoms stand out depends on age. Hyperactivity is usually most noticeable during the preschool and elementary school years, and inattention comes to the fore late in elementary and middle school^[1]. In adolescents, hyperactivity may shrink to fidgeting or a feeling of jitteriness and impatience^[1].

Symptoms can also fade temporarily under close supervision, in a new setting, during an engrossing activity or with frequent rewards^[1].

Parents reported a current ADHD diagnosis for an estimated 11.7% of U.S. children aged 3 to 17 in 2024, about 7 million children^[5]. In 2022 to 2023 data, boys (13%) were diagnosed more often than girls (7%), and about 6 in 10 children with ADHD had moderate or severe ADHD^[5]. The children and adolescents pages break these figures down further.

NIMH notes that children with ADHD are at increased risk for injuries, social problems, family stress and poor grades^[3].

In most cases, hyperactivity and impulsivity taper off with age. Most adults with ADHD struggle mainly with inattention: disorganization, forgetfulness, unreliability, and difficulty with planning, finishing tasks and managing time^[1].

An estimated 6.0% of U.S. adults had a current ADHD diagnosis in late 2023, roughly 15.5 million people^[6]. More than half of them (55.9%) were diagnosed at age 18 or older, even though the DSM-5 requires several symptoms before age 12^[6][1]. More adult figures are on the adults with ADHD page.

Symptoms rarely switch off cleanly. In the Multimodal Treatment Study of ADHD, about 30% of children with ADHD reached full remission at some point, but 60% of those later had a recurrence^[7]. Only 9.1% showed sustained recovery by the study's end, 10.8% had persistent ADHD at every check-in, and 63.8% moved in and out of remission^[7].

An older meta-analysis, summarized by SAMHSA, found that 15% of children with ADHD still met full criteria as young adults, and 65% did when partial remission was counted^[1]. For teens and adults, NIMH links ADHD with higher rates of risky behavior, including substance use, and with poor job performance and financial problems^[3].

The DSM-5 uses the same 18 symptoms for everyone^[1], but the way they surface differs by sex on average. A 2020 expert consensus statement in BMC Psychiatry found that community samples show more inattentive-type ADHD in girls, while hyperactive-impulsive symptoms may be more common in boys and are linked to higher rates of clinic referral^[8]. Inattention is less visible, so it is less likely to be noticed^[8].

Girls may also use compensatory behaviors, such as compliance, social adaptation or coping strategies that mask symptoms, which can prevent referral^[8]. Emotional problems, anxiety and depression are more often reported in females with ADHD, and women may receive a primary diagnosis of an internalizing or personality disorder first, delaying ADHD recognition^[8].

Boys are diagnosed far more often in childhood, but the consensus statement notes that sex differences in adult samples are more modest or absent^[8]. In adulthood, men with ADHD more commonly show antisocial behaviors^[8]. See the women and ADHD and men and ADHD pages for prevalence by sex.

ADHD often co-occurs with disruptive behavior, learning disorders, sleep problems, anxiety and depression, which can make each condition harder to diagnose^[3]. Nearly 78% of U.S. children with ADHD had at least one other condition in a 2022 parent survey^[5].

ADHD is not a form of autism. They are separate diagnoses that frequently appear together, and a 2023 meta-analysis of 72 studies estimated that 37% of autistic children and adults also have ADHD^[9]. In the other direction, 14.4% of U.S. children with ADHD also had an autism diagnosis^[5].

Both fall under the broader neurodivergent umbrella.

Overlap also runs through look-alike symptoms. A medical exam that includes hearing and vision tests is one step in a child's evaluation, to rule out other problems that can resemble ADHD^[4].

No single test diagnoses ADHD. A psychologist, psychiatrist or primary care provider such as a pediatrician can make the diagnosis^[4]. For children, the American Academy of Pediatrics recommends that providers ask parents, teachers and other caregivers about behavior at home, at school and with peers^[4].

For adults, one validated self-report tool is the six-question World Health Organization Adult ADHD Self-Report Scale (ASRS) Screener. In a study of 668 U.S. health plan members, its results agreed strongly with clinician diagnoses, with an area under the curve of 0.90^[10]. A screener flags who may need an evaluation; it does not confirm a diagnosis.

There is no single red flag either. The pattern that matters is the one in the criteria: symptoms that started in childhood, show up in more than one setting and cause real problems^[1]. A child who is only inattentive in one class, or an adult whose focus fell apart after a new stressor, does not match that pattern on its own.

In 2023, 36.5% of U.S. adults with ADHD were receiving no treatment^[6]. Medication classes and what trials show are in ADHD meds, and usage trends are in ADHD medication statistics.