ADHD in children: signs of inattention and hyperactivity, diagnosis and treatment

Is your child just active, or is it ADHD? The direct answer

Not every very active child has a disorder. ADHD in children, attention-deficit/hyperactivity disorder, is a condition that begins in childhood and is diagnosed only when signs of inattention or hyperactivity and impulsivity persist for at least six months, appear in two or more settings such as home and school, and disrupt the child's schooling, relationships or daily life, according to the U.S. National Institute of Mental Health (NIMH).

As the U.S. Centers for Disease Control and Prevention (CDC) puts it, every child struggles to concentrate or behave well now and then; what sets ADHD apart is that the difficulties do not pass, may be severe, and get in the way at school, at home or in friendships. The reassuring news is that effective treatments exist, and parents play a central role in them.

In this article you will learn the core signs by age, how the disorder is really diagnosed, what can look like it, how treatment starts safely, and when your child should see a doctor.

Signs of ADHD in kids: inattention, hyperactivity and impulsivity

The signs fall into two groups, as NIMH describes them. One or two signs are not enough, since all children do some of these things sometimes; what matters is how many there are, how often they happen and their impact.

Signs of inattention

• Makes careless mistakes by missing details in homework and exams.
• Finds it hard to stay focused during play or lessons.
• Seems not to be listening when spoken to directly.
• Doesn't follow instructions through and doesn't finish homework or tasks.
• Has trouble organizing belongings and time, and avoids tasks that need long mental effort.
• Often loses things, forgets daily activities and is distracted by any sound or movement.

Signs of hyperactivity and impulsivity

• Fidgets, squirms in their seat and gets up when asked to stay seated.
• Runs or climbs where it isn't appropriate, and never settles, as if driven by a motor.
• Finds it hard to play quietly, and talks a lot.
• Blurts out answers before the question is finished, and can't wait their turn.
• Interrupts others and intrudes on their conversations and games.

A child may show mainly inattention, mainly hyperactivity and impulsivity, or both together. NIMH notes that boys tend more toward hyperactivity and impulsivity, while girls are more often diagnosed with the mainly inattentive type; so don't overlook the quiet, daydreaming girl just because she doesn't disturb anyone.

How do the signs change with age?

• Before school: extra activity and impulsivity may be what parents notice most. Because many young children are very active anyway, assessment at this age needs particular expertise, and guidelines start treatment at this age with parent training.
• At school age: attention difficulties become clearer as schoolwork demands grow: unfinished homework, disorganized notebooks and repeated complaints from teachers. This is when parents often say, "My child can't focus at school."
• In adolescence: according to NIMH, visible hyperactivity usually lessens and the teenager may seem restless or fidgety instead, while inattention and impulsivity often continue. Teenagers with ADHD are also more prone to risky impulsive behavior, including drug use; so watch for the signs of drug use in teenagers.

NIMH points out that symptoms often continue into adolescence and adulthood, although in some people they ease over time. To see how the disorder looks in grown-ups, read ADHD in adults.

ADHD or just an active child? Questions that tell them apart

An active child runs and plays a lot, but can calm down when needed, learns and makes friends. When it is a disorder, the picture is different. Ask yourself:

1. Does it persist? The signs are present most of the time and have been for at least six months, not for a few weeks linked to a particular situation.
2. Does it appear in more than one setting? If the child is distracted only in class and calm everywhere else, the cause may lie in the classroom itself, the way lessons are taught, or a learning difficulty.
3. Is it more than expected for their age? A four-year-old can't be compared with a ten-year-old.
4. Does it disrupt their life? Falling behind at school, rejection by classmates, repeated injuries from impulsivity, or constant clashes at home.
5. Did it start early? Diagnosis requires the symptoms to have begun in childhood, before age 12.

And remember that stress, lack of sleep, anxiety, depression and some physical illnesses can cause symptoms that look like ADHD, as NIMH explains; so the question is never settled by a single observation.

How is ADHD diagnosed? Is there a test for kids?

The CDC stresses that there is no single test that diagnoses ADHD: no blood test and no scan. Diagnosis is made by a trained psychiatrist, pediatrician or psychologist, and usually involves these steps:

1. A detailed history: when the signs started, how pregnancy and development went, and what happens at home and at school.
2. Information from more than one source: the doctor asks parents, teachers and caregivers about the child's behavior in different settings, so the school report is an important part of the assessment.
3. Behavior rating scales: standardized questionnaires completed by parents and teachers; the UK's NICE guidelines recommend that diagnosis should not rest on them alone.
4. A medical examination: including hearing and vision checks, because a child who can't hear or see well may seem inattentive.
5. Further assessment when needed: to look for learning difficulties or other conditions that can look like ADHD or come with it.

The doctor then matches what has been gathered against the recognized diagnostic criteria: enough signs (six or more from one of the two groups for children up to age 16), starting before age 12, lasting six months, appearing in two or more settings, and disrupting the child's life.

Is ADHD a symptom of autism? Conditions that can look similar

ADHD is not a symptom of autism: they are two different developmental conditions, but they share some traits (such as intense focus on a favorite interest, trouble controlling emotions and sensory difficulties) and can occur together. Cleveland Clinic (2024) notes that since 2013 the American diagnostic manual, DSM-5, has allowed both to be diagnosed together, and that research indicates between 50% and 70% of people with autism also have ADHD. Key differences include:

• Attention to detail: a child with ADHD tends to overlook details, while a child with autism may focus closely on details and take things literally, sometimes rigidly.
• Social communication: a child with ADHD may miss social cues because of distraction or impulsivity, whereas a child with autism finds it hard to read and interpret those cues in the first place.
• Routine: a child with ADHD tends to seek novelty, while a child with autism is more comfortable with a fixed routine.
• Movement: the first is restless and finds it hard to stay still; the second may repeat particular movements or behaviors for comfort.

Other conditions can resemble ADHD or come with it, as the CDC and NIMH mention: anxiety, which makes a child distracted and tense (see anxiety symptoms), hearing problems, sleep problems, learning difficulties, and depression and stress. That is why assessment needs a specialist who can tell them apart, since the child may need entirely different treatment.

ADHD treatment for children: a plan that depends on age

Treatment is a plan the doctor puts together with the family and school according to the child's age and how severe the condition is. Its aim is for the child to learn, behave and get through the day better.

Parent training and behavioral therapy

The CDC recommends that treatment for children under six start with parent training in behavior management before any medicine is tried, and NICE recommends group parent-training programs as a first step for children under five. Parents learn to praise good behavior as soon as it happens, give short and clear instructions, and handle difficult behavior calmly and consistently. Older children may benefit from cognitive behavioral therapy, which teaches them to break big tasks into small steps, as NIMH explains. A parent-training program with a specialist can help you put this into practice at home.

School support

The CDC recommends classroom behavioral interventions and school support as part of the treatment plan. NICE suggests simple changes to the child's environment: changing where they sit and reducing distractions, shorter periods of focus broken up by movement breaks, and writing instructions down as well as saying them, with a written treatment plan shared with the school with the family's consent.

When is medication considered?

For children aged six and over, the CDC recommends combining medication with behavioral therapy. NICE states that medication should be offered to a child aged five or over only if symptoms still clearly disrupt their life after changes to their environment have been made and reviewed, and that a child under five should not be given medication without a second opinion from a specialist in this age group, with a full medical assessment before starting and regular follow-up afterward, including height and weight. The doctor may need to try more than one option, or adjust it, to find the balance between benefit and side effects.

Please note that Oxygen Center does not treat children under 15. For a younger child, see a child psychiatrist or a pediatrician, who can guide you to the right specialist. If your child is a teenager aged 15 or over, the path at Oxygen can start with an appointment with a psychiatrist, followed when needed by therapy sessions or behavior modification sessions, with a parent or guardian's consent for anyone under 18.

Common myths: herbs, sugar and screens

• "Herbs and supplements cure it for good": NIMH explains that natural products, vitamins, supplements and diet changes have generally not been shown to treat ADHD, and NICE advises against using fatty acid supplements to treat it. Be wary of any product that promises a quick or permanent cure.
• "Sugar is the cause": a meta-analysis published in JAMA in 1995 pooled 23 studies (from 16 papers) that compared sugar with a placebo without the children, their parents or the researchers knowing which was given, and found that sugar does not affect children's behavior or thinking, although the researchers could not rule out a small effect in some children, and suggested parents' strong belief comes from expectation.
• "Screens cause ADHD": a 2018 study in JAMA followed teenagers aged 15 and 16 for two years and found a modest link between frequent digital media use and later ADHD symptoms, but the researchers said more research is needed to know whether it is cause and effect. Managing screen time is a good habit within the family routine, but it is not a treatment for the disorder.
• "Cutting out colorings and additives is enough": NICE does not recommend removing them from the diet of all children with ADHD as a general treatment, and any special diet should be supervised by a doctor and a dietitian.

When should your child see a doctor?

Book an appointment with a child psychiatrist or pediatrician if you notice:

• Signs of distraction or excess activity that have lasted six months or more, at home and at school.
• Repeated complaints from school, or falling grades despite their effort and studying.
• Repeated injuries or dangerous situations because of impulsivity.
• Rejection by classmates or isolation, or describing themselves as "stupid" or "bad".
• Daily clashes at home that have exhausted the whole family.
• A teenager who has started risky behavior or shows signs of drug use.