Adult ADHD: symptoms, screening, and professional assessment

CareOps editorial team · October 9, 2026 · 6 min read

General information and service guidance published by CareOps. This is not an individual diagnosis or treatment plan.

Translated from our Korean guide. Korean public services, insurance, and helpline numbers refer to South Korea. For urgent help elsewhere, contact local emergency services or a crisis line in your country.

Even though I know what to do, I can't start, and once I start, I can't finish, and I forget important promises. If you've been told for a long time that you're not trying enough, it may be a problem with how you control your attention, not your will.

What do adult ADHD symptoms look like?

ADHD (Attention Deficit Hyperactivity Disorder) is a neurodevelopmental characteristic that begins in childhood. As we become adults, the hyperactivity of running around decreases, and the difficulty with holding attention and completing tasks in order becomes more prominent. That's why it's easy to be misunderstood as being 'lazy' or 'stupid'.

“Hyperfocus”—becoming absorbed in something interesting for hours—can also occur. This may look like choosing not to concentrate, but the difficulty is often regulating where attention goes, rather than simply how much concentration you have.

When might everyday difficulties warrant an ADHD assessment?

Everyone forgets and puts things off. The diagnostic criteria (DSM-5) used in mental health medicine look at the following conditions rather than the number of symptoms.

1. Since childhood — Some of the symptoms have been present since before the age of 12.
2. In many places — Appears in two or more places: home, work (school), or interpersonal relationships.
3. Continuously — continues for over 6 months. For adults, the standard is to have at least five out of nine symptoms of inattention, hyperactivity, or impulsivity.
4. Clearly disrupted — I'm actually losing out on work, school, and relationships.
5. Not to mention other reasons — lack of sleep, depression, anxiety, thyroid problems, etc. can create a similar look.

If you have suddenly had trouble concentrating in the past few months, look for causes other than ADHD first. Burnout, Depression, and Sleep problems are the first to break concentration.

Adult ADHD self-screening, how to read the results

The most widely used self-screening tool is the Adult ADHD Self-Report Scale (ASRS), created jointly by the World Health Organization (WHO) and researchers. The six-question screening form asks about your performance over the past six months, and if four or more of the six items exceed the standards, it is considered 'worthy of a more detailed evaluation.'

• A positive screen is not a diagnosis. This is because the course of childhood and other causes were not checked.
• Even if it is audio, it is worth consulting if the difficulty is significant. Six questions cannot cover everything.
• Depends on your current condition. Your score goes up during sleepless weeks and times of great stress.

How are tests and diagnoses made at the hospital?

Adult ADHD is diagnosed by a psychiatrist. It is not determined by a blood test or a brain picture, but the interview is the focus.

1. Current Difficulty — Talk about how often and how much of a disruption it is in a certain situation.
2. Childhood — Ask about what your elementary school days were like. Life records and family memories are helpful.
3. Check for other causes — Look at sleep, mood, anxiety, alcohol, and physical illnesses together.
4. Auxiliary testing — If necessary, add questionnaires, computer-based attention tests, and psychological tests. Diagnosis is not made with just one test number.

Test costs vary greatly from hospital to hospital depending on which tests are bundled together. When making your appointment, ask 'What tests are included in an adult ADHD evaluation and how much does it cost?' If you are concerned about your medical records, first read Where are psychiatric records kept and who can see them.

Adult ADHD Treatment and What You Can Try Today

The British National Institute for Health and Care Excellence (NICE) guidelines recommend drug treatment for adult ADHD, and also recommend psychological intervention such as cognitive behavioral therapy when medication is not desired or medication alone is not sufficient. Whether medication is needed and which medication is appropriate will be decided with the doctor during treatment.

Regardless of diagnosis, the methods below are helpful for anyone who is easily distracted. The key is transferring tasks that were previously left to memory and will to a device outside of the head.

• One place to write things down — I only use one calendar and one to-do list. If it's scattered across multiple apps, it's something you'll forget.
• Make the first action 10 minutes long — Instead of ‘writing a report,’ break it down into ‘open the file and write a three-line table of contents.’
• Alarm at start time — Deadline alarm is late. Set an alarm that says ‘Start Now’.
• Place things in place — Always put your keys, wallet, and earphones in the same place.
• Clear your eyes — Leave only the task you are working on on your desk and turn off notifications.
• Wake your body up first — Sitting is easier if you start after a short walk or stretch.

This article provides general information, not diagnosis or treatment. For urgent help, contact local emergency services or a crisis line in your country. In South Korea, the suicide prevention helpline is 109 (24 hours), and the mental health crisis line is 1577-0199.