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Mental Health

Attention-Deficit/Hyperactivity Disorder in Adults


Author: Canadian Mental Health Association, BC Division


Everyone feels distracted and restless at times. For the most of us, the feelings pass and we can easily get back to work. Some people struggle with these problems for many years.

Some people don’t realize they have an illness until their child has similar problems and is diagnosed with attention-deficit/hyperactivity disorder. Others don't even realize that they have an illness—they assume their illness is "just who they are." Attention-deficit/hyperactivity disorder can affect adults, too, and it can cause a lot of distress. But proper diagnosis and treatment can help you feel better and gain control of your life.

What is it?

Attention-deficit/hyperactivity disorder, or ADHD, affects the way you act and focus. ADHD is usually diagnosed in school-aged children, but it can continue to cause problems into adulthood. About two-thirds of people living with ADHD continue to experience symptoms as an adult.

If you live with ADHD, you might have problems paying attention, concentrating on one task or organizing things. You might make careless mistakes at work or frequently forget things. This is the inattention group of symptoms. You might have a hard time sitting still, fidget all the time or feel very restless. Or you might have a hard time controlling urges and take a lot of risks. You might do things without considering the results or act before you think. This is the hyperactivity and impulsivity group of symptoms. These symptoms last for a long time, don't change in different places (such as at work and at home), and can cause a lot distress or problems.

Inattention symptoms in particular tend to affect adults, and may also make tasks like planning and setting priorities difficult. A type of inattention more common in adults is hyperfocus: focusing so strongly on something that catches your interest that it's difficult to move your attention to more important tasks. While it may sound like the opposite of inattention, hyperfocus makes it hard to pay attention to information or tasks that should have priority.

Impulsivity may be less frequent or obvious in adults than in children, but the impact of impulsive decisions can be very harmful. For example, adults may quit school, quit a job, get into car accidents, or have problems with substance use.

You may be diagnosed as an adult with ADHD, but you must have experienced some ADHD symptoms by the age of 12—there is no such thing as ADHD that starts when you're an adult. Some people cope with symptoms when they were children, but the demands of adulthood make the symptoms more obvious and more troublesome.


Why is ADHD in adults hard to diagnose?

ADHD can be harder to diagnose in adults for some of these reasons:

  • Other mental illnesses can cause problems with attention or behaviour so it may be harder to see what's going on. For example, some mood disorders can cause problems with concentration, some anxiety disorders can cause problems with restlessness, and some personality disorders can cause problems with impulsivity

  • Clinicians may have less training to recognize ADHD in adults, although this is starting to improve

  • Adults can develop coping strategies that "hide" symptoms. For example, an adult who feels very restless can choose a busy, fast-paced job


Who does it affect?

About 4% of adults experience some or all ADHD symptoms. It affects men and women almost equally.

Family members

ADHD seems to run in families, so you are much more likely to have ADHD if a close biological relative has ADHD.

Other mental illnesses

More than three-quarters of adults living with ADHD have another mental illness. The most common mental illnesses are depression, bipolar disorder, social anxiety disorder, substance use disorders and personality disorders.


Could I have ADHD?


What causes ADHD?

ADHD is likely caused or influenced by many different things. Examples include your genes, the environment you live in, and your life experiences.


What can I do about it?

ADHD is usually treated with a combination of medication, counselling, and self-care.


Adults are often treated with the same kind of stimulant and non-stimulant ADHD medication as children. If you are interested in trying a medication, talk to your doctor so you can discuss the best options based on your health needs and goals.


Cognitive-behavioural therapy (CBT) teaches you the relationship between your thoughts, moods and behaviours. It has been adapted to help people living with ADHD. A therapist can also help you make changes in your behaviour. These changes help you replace unhelpful behaviours with helpful behaviours. This may help you manage symptoms and live well. It’s also important to learn about ADHD, which should be part of any type of counselling. Family therapy can help your entire family understand ADHD.


Strategies like maintaining a consistent schedule and using notes, lists or charts to keep you on track may help. Some people find it useful to change their work environment, such as working in a quieter location, using headphones to block noise, changing lighting, or scheduling more frequent breaks. Your mental health practitioner can suggest specific strategies to help you cope with your symptoms. Many adults living with ADHD experience sleep problems, so good sleep habits are particularly important. Strategies like regular exercise, eating well, staying in touch with family and friends, joining a support group, and doing things you enjoy can help everyone improve their well-being.


Where do I go from here?

In addition to talking to your family doctor, check out the resources below for more information about attention-deficit/ hyperactivity disorder:

BC Partners for Mental Health and Substance Use Information

Visit for the Managing a Mental Illness series of info sheets, which are full of information and tips to help you learn more and take charge of your health.

Canadian ADHD Resource Alliance (CADDRA)

Visit for information and resources, including the Canadian ADHD Practice Guidelines for doctors.

Centre for ADHD Awareness, Canada (CADDAC)

Visit for information and resources, advocacy tips, strategies for students pursing post-secondary education, and more.

HealthLink BC

Call 811 or visit to access free, non-emergency health information for anyone in your family, including mental health information. Through 811, you can also speak to a registered nurse about symptoms you're worried about, or talk with a pharmacist about medication questions. If you'd like to speak to someone in another language, say the name of your preferred language in English to be connected to an interpreter. More than 100 languages are available.



If you are in distress, need information on local services, or you just need to talk with someone, call 310-6789 (no area code) 24 hours a day to connect to a BC distress line, without a wait or busy signal.


About the author

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The Canadian Mental Health Association promotes the mental health of all and supports the resilience and recovery of people experiencing a mental illness through public education, community-based research, advocacy, and direct services. Visit


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