When to get evaluated for adult ADHD

Most adults who wonder about ADHD have been wondering for a while. They forget things, lose track of time, start more than they finish, or feel restless in meetings, and they are not sure whether that is a disorder or just how they are. This page sets out the signals that make an evaluation worthwhile, the situations where it makes sense to act sooner, and what you can do before the appointment.

Everyone gets distracted. What is different about ADHD?

The National Institute of Mental Health (NIMH) is direct about this: many people show some of these behaviors some of the time. For adults with ADHD, the behaviors are more severe, frequent and persistent, interfere with daily life, occur across multiple situations and last at least 6 months. NIMH also describes the diagnostic rules for adults:

• symptoms must have started before age 12;
• adults and adolescents over 16 need five (instead of six) symptoms of inattention or of hyperactivity and impulsivity;
• the pattern must make it hard to function in at least two areas of life, such as home, school or work.

You do not have to work out whether you meet these rules before you ask for an evaluation. That is the evaluator's job. But they explain what an evaluator will be looking for, and they are covered in more depth in adult ADHD diagnostic criteria explained and in the overview of adult ADHD symptoms.

Signals that an evaluation is worth it

The UK's National Institute for Health and Care Excellence (NICE) gives one of the clearest published thresholds. Its guideline says adults without a childhood diagnosis should be referred to a specialist trained in ADHD when typical symptoms (inattention, hyperactivity or impulsivity):

1. began during childhood and have persisted throughout life;
2. are not explained by other psychiatric diagnoses, although other conditions may coexist;
3. have resulted in, or are associated with, moderate or severe psychological, social, educational or occupational impairment.

In everyday terms, the questions to ask yourself look like this:

Why it often surfaces in adulthood

Many adults first ask about ADHD after a change: a promotion, a first child, graduate school, a move to a demanding job. NIMH gives reasons someone may not be diagnosed until adulthood. Teachers and parents may not have recognized the disorder, or may have provided supportive environments that helped a child thrive anyway. A milder form may have been manageable until the stresses and demands of adulthood, especially at work. NIMH adds that symptoms in girls and women are especially likely to have been missed in childhood, and NICE warns that women may be more likely to receive an incorrect diagnosis of another condition. The groups page on ADHD in women covers this.

NIMH's position on timing is simple: it is never too late to seek a diagnosis and treatment.

Groups who may want to ask sooner

NICE lists groups with a higher prevalence of ADHD than the general population. Among those relevant to adults:

• people with a close family member diagnosed with ADHD;
• adults with a mental health condition;
• people with a history of substance misuse;
• people with epilepsy or an acquired brain injury;
• people with other neurodevelopmental conditions, such as autism or specific learning difficulties.

Being in one of these groups does not mean ADHD is present. It means it is worth considering when attention problems are persistent.

When something else may need attention first

Some situations call for care now, whatever the cause turns out to be:

• Crisis. If you are thinking about suicide or harming yourself, or are in emotional distress, call or text 988, or chat at 988lifeline.org. The 988 Lifeline is available 24/7/365, and conversations are free and confidential.
• Severe sleep problems. NIMH reports that sleep problems affect up to 70% of adults with ADHD, and the CDC lists sleep disorders among conditions with symptoms similar to ADHD. Raise sleep at the start; an evaluation should ask about it anyway.
• Heavy substance use. A 2024 review in American Family Physician notes substance use disorders among the conditions to consider alongside or instead of ADHD. Be open about alcohol, cannabis and other substances.
• Low mood or constant worry. Depression and anxiety can look like ADHD, and can also occur with it. The comparison pages on ADHD or anxiety and ADHD or depression explain how evaluators tell them apart.

Already diagnosed as a child?

If you were diagnosed or treated for ADHD as a child and the symptoms still cause problems, NICE recommends assessment in adult services when the symptoms are associated with at least moderate impairment. Bring old records if you can find them. See restarting ADHD care as an adult.

What to do before you book

• Take the six-question adult ADHD self-test and keep your answers. A screener does not diagnose, but it gives you a structured way to describe recent symptoms. The guide on what self-test results mean explains how to read it.
• Write down three or four concrete examples of how the problems affect work, home and relationships.
• Ask a parent or older relative what you were like as a child, if that is possible for you.
• List medications, supplements, sleep habits and substance use.

The New York guide's page on preparing for an adult ADHD evaluation has a fuller checklist.

When to talk to a clinician

If the problems are persistent, show up in more than one part of life and are costing you, that is enough reason to talk to a clinician. You do not need to be certain it is ADHD. A good evaluation answers that question either way, and also looks for other explanations that deserve treatment.

Dr. John C. Shershow, M.D. is a psychiatrist who focuses on adult ADHD and sees adults located in New York or New Jersey. The adult ADHD evaluation page describes what his assessment covers. For location-specific details, see adult ADHD testing in NYC or adult ADHD testing in New Jersey. To start, call the office or use the call-back form.