What Is ADHD?

Attention-deficit/hyperactivity disorder (ADHD) is a neurodevelopmental disorder that can affect attention, organization, impulse control, activity level, and the ability to manage everyday demands.

Although ADHD begins and is often associated with childhood, it can continue into adulthood. Adults with ADHD may experience difficulties with work, school, relationships, time management, organization, or completing everyday tasks.

ADHD is not simply a matter of being distracted or having poor motivation. ADHD symptoms need to be persistent and significant enough to cause difficulties in important areas of life. There is also no biological test that can diagnose ADHD. Diagnosis involves a comprehensive clinical assessment that considers developmental history, current symptoms, functioning, and other possible explanations.

What Are Adult ADHD Symptoms?

ADHD may look different from person-to-person. Common adult ADHD signs include:

• Attention: becoming easily distracted, losing track of conversations, or having difficulty sustaining attention on tasks that are not especially engaging

• Organization: having difficulty planning, prioritizing, keeping track of belongings, or managing multiple responsibilities

• Time management: underestimating how long tasks take, frequently running late, or struggling to get started on tasks

• Working memory: forgetting instructions, appointments, deadlines, or other things that were just discussed

• Impulsivity: interrupting, making decisions quickly, or acting before considering the consequences

• Hyperactivity or restlessness: feeling internally or physically restless or having difficulty slowing down

• Task initiation and completion: knowing what needs to be done, but having difficulty getting started or following through

These difficulties can affect employment, education, relationships, finances, household responsibilities, and overall quality of life.

Not everyone with ADHD experiences the same symptoms. Some adults primarily experience difficulties with attention and organization, while others experience more prominent impulsivity or hyperactivity.

How Common Is ADHD in Adults?

ADHD is relatively common in adulthood. A 2023 research review of five systematic reviews and meta-analyses estimated that approximately 3.1% of adults have ADHD.

What Causes ADHD?

Research suggests that ADHD develops through a complex interaction of genetic and environmental factors. There is no single cause of ADHD.

ADHD is strongly influenced by genetics, but having a family member with ADHD does not mean that someone will necessarily develop the disorder. ADHD is also shaped by context. A person may function relatively well in one environment while experiencing significant difficulties in another. For example, highly structured environments may reduce the impact of some ADHD-related difficulties, whereas environments requiring considerable self-management may make them more apparent.

How Is ADHD Assessed and Diagnosed?

A proper assessment involves understanding the person’s current difficulties, as well as their developmental history. During an ADHD assessment, a psychologist may explore: current symptoms and concerns; childhood and developmental history; school and academic experiences; work and occupational functioning; relationships and social functioning; organization, time management, and daily functioning; sleep and other health factors; mental health and substance use; family history; and other conditions that can cause similar difficulties. Symptoms across different environments are also important to assess. For example, an assessment may explore if ADHD symptoms at work are also present at home or in social situations.

Clinicians may also use standardized questionnaires or rating scales, as well as cognitive testing, as part of the assessment.

An adult ADHD diagnosis is not based solely on the presence of a few ADHD-like symptoms. A psychologist must consider the overall pattern, persistence, developmental history, and functional impact of the difficulties in determining a diagnosis.

What Treatments Work for Adult ADHD?

There are different evidence-based treatments for ADHD. Depending on the person and their circumstances, ADHD treatment for adults may involve psychological interventions, medication, or a combination of approaches.

Psychological treatment

Cognitive behavioural therapy (CBT) has been studied extensively for adults with ADHD. CBT for adult ADHD can focus on practical skills such as: managing time; organizing tasks and information; breaking large tasks into manageable steps; reducing procrastination; managing distractions; developing routines; addressing unhelpful thoughts and beliefs; and managing emotion regulation difficulties associated with ADHD.

Research reviews have found that CBT can reduce ADHD symptoms in adults, with evidence also suggesting improvements in associated anxiety and depressive symptoms.

Medication

Medication is another evidence-based treatment option for ADHD. Common medication approaches include stimulant and non-stimulant medications.

A 2025 research review found evidence that stimulant medications, as well as atomoxetine reduce core ADHD symptoms in adults in the short term. Evidence regarding longer-term outcomes and outcomes, such as quality of life, remained more limited.

Psychologists in Ontario do not have the authority to prescribe medications. Informed by a thorough assessment, medication decisions should be made with an appropriately qualified prescriber, such as a physician or nurse practitioner, taking into account symptoms, benefits, side-effects, other health considerations, and individual preferences.

Combining approaches

For some people, combining medication with psychological treatment can be useful. Research examining CBT alongside medication has found additional improvements in ADHD symptoms compared with medication alone.

What Does Improvement Look Like?

Treatment for ADHD is not necessarily about eliminating every symptom. For many adults, meaningful improvement may involve becoming better able to organize daily responsibilities, reduce procrastination and complete important tasks, maintain routines, manage impulsive behaviour, improve relationships, be more effective at work or school, and reduce emotional distress. Ultimately, the goal of treatment, however it is individualized to people, is to improve functioning and quality of life.

How Can Recovery Paths Psychology Centre Help?

Psychologists at Recovery Paths can help you understand whether your experiences are consistent with ADHD and the extent to which other factors may also be contributing to your difficulties. Depending on your needs, psychological services may include one or more of the following:

Assessment of ADHD
A comprehensive assessment to explore your symptoms, developmental history, functioning, and other factors that may be relevant to diagnosis.

Psychoeducation
Understanding ADHD and how it affects your particular strengths and difficulties.

CBT and skills-based treatment
Therapy focusing on practical strategies for organization, time management, procrastination, emotional regulation, and managing ADHD-related challenges.

Support for co-occurring concerns
Adults with ADHD may also experience anxiety, depression, substance use concerns, sleep difficulties, or relationship challenges, among other issues. Integrated treatment can address these concerns alongside ADHD.

Contact Us to Learn More about the Psychological Services for Gambling Disorder at Recovery Paths Psychology Centre

Last updated: October 2026