ADHD in Adults: How to Tell It Apart From Ordinary Absent-Mindedness and Fatigue

What ADHD in Adults Is

ADHD is a neurodevelopmental disorder: differences in how the brain systems responsible for attention, impulse control, and self-organization work take shape from early childhood. ICD-10 describes the condition under hyperkinetic disorders, while ICD-11 and DSM-5 describe it as attention-deficit/hyperactivity disorder. In many people, symptoms soften with age, but in a substantial proportion they persist into adult life.

For a long time, ADHD was considered a “childhood” diagnosis. It is now known that it is fairly common in adults but often goes unrecognized, especially in women and in people with high intelligence who compensated for their difficulties at school. Such people often live with the feeling that they are “lazy” and “disorganized,” even though they put in more effort than others just to manage ordinary tasks.

Signs of ADHD in Adults

DSM-5 criteria divide symptoms into two groups: inattention and hyperactivity-impulsivity. For adults, five signs from either group are enough for a diagnosis, provided they have lasted at least six months, began before age twelve, and cause problems in at least two areas of life. Below is how these signs look in everyday adult life rather than in a child psychiatry textbook.

Inattention

It is hard to stay focused on boring tasks, and paperwork and reports get put off until the last minute. Keys, phones, and documents are constantly lost. The person forgets appointments, deadlines, and promises, gets distracted by background sounds and thoughts, often does not listen to the other person until the end, starts many things without finishing them, and makes careless mistakes.

Hyperactivity in Adults

Adults rarely run around the room, but they find it hard to sit through long meetings; they keep fidgeting, drumming their fingers, or jiggling a leg. A feeling of inner restlessness, of a “motor running inside,” and difficulty resting without doing something are typical. Many choose active jobs or keep themselves busy all the time so as not to get bored.

Impulsivity

The person interrupts others, answers before hearing the whole question, and struggles to wait their turn. They spend money, change jobs, and make decisions impulsively and later regret them. There may be sudden flashes of irritation that pass quickly. Relationships and finances often suffer, as does safety behind the wheel.

Emotions and Time Management

Although these are not formal criteria, adults with ADHD often have difficulty regulating emotions, high sensitivity to criticism, and “time blindness,” meaning constant lateness and underestimating how long things will take. Hyperfocus is also typical: the ability to become absorbed in something interesting for hours, forgetting everything else.

How ADHD Differs From Ordinary Absent-Mindedness and Fatigue

Everyone gets absent-minded sometimes: after a sleepless night, when overloaded at work, or during a period of stress or illness. The main difference is that in ADHD the difficulties are persistent and have accompanied the person since childhood, across different circumstances: at work, at home, and on vacation. A well-rested person with ADHD still loses things, puts off tasks, and struggles to concentrate on boring things.

How much the difficulties affect life also matters. In ADHD, they lead to real consequences: missed deadlines, frequent job changes, financial problems, conflicts, and traffic fines. Ordinary absent-mindedness is unpleasant but rarely adds up to such a picture. If you recognize yourself, think about whether things were like this in your school years; that is a key question for the doctor.

Conditions That Can Look Like ADHD

Trouble concentrating is one of the least specific symptoms in medicine. It can be caused by anxiety disorders, depression, chronic sleep deprivation and sleep disorders including sleep apnea, hypothyroidism and hyperthyroidism, anemia, the after-effects of a traumatic brain injury, alcohol and drug use, and medication side effects. Similar difficulties occur in bipolar disorder, but there they come in waves along with mood changes.

Another complication is that ADHD often co-occurs with other conditions: anxiety, depression, addictions, and sleep disorders. That is why a good assessment always considers these possibilities. If only anxiety is treated and ADHD is missed, the result will be incomplete, and vice versa. This is exactly why self-diagnosis using online tests is unreliable and the assessment is best left to a doctor.

• Anxiety disorder: attention is “hijacked” by worry
• Depression: low energy, loss of interest, slowed thinking
• Sleep disorders and chronic sleep deprivation of any cause
• Thyroid disease and other endocrine disorders
• Use of alcohol, cannabis, and other substances
• Bipolar disorder with episodes of hypomania
• Occupational burnout and prolonged stress

What an Adult ADHD Test Can Show

The best-known screening tool is the Adult ADHD Self-Report Scale (ASRS), developed with the participation of the WHO. It asks how often you have experienced typical difficulties over the past six months. A high score means the likelihood of ADHD is increased and it is worth seeing a specialist. But it is not a diagnosis: the questionnaire cannot distinguish ADHD from anxiety, depression, or lack of sleep, and the result is affected by your mood on the day you fill it in.

For diagnosis, a psychiatrist uses a structured interview, questionnaires for the adult and, where possible, for people close to them, and information about childhood, such as school reports and parents’ accounts. Tests are sometimes ordered to rule out physical causes. Computerized attention tests can add to the picture, but on their own they neither confirm nor rule out the diagnosis.

How ADHD Is Diagnosed and Treated

An initial assessment can conveniently be done online: a Psychiatry Online doctor will ask in detail about your difficulties, when they began, how they affect your life, and about sleep, mood, substance use, and physical illnesses. It helps to write down examples of your difficulties in advance, find old school report cards or teacher evaluations, and ask a relative to describe what you were like as a child. Afterwards, the doctor will tell you how likely ADHD is, which tests are needed, and what to do next.

ADHD treatment is comprehensive. Psychoeducation helps you understand how your brain works and stop blaming yourself. Cognitive behavioral therapy adapted for ADHD and coaching teach practical strategies: external reminders, breaking tasks into steps, planning, and dealing with procrastination. When indicated, the doctor may prescribe medication; the choice of drug and regimen is solely the specialist’s decision, and in Kazakhstan the prescription of certain drug groups is governed by special rules.

When to see a doctor

• Since childhood, you have had trouble with attention, organization, and finishing what you start
• Forgetfulness and procrastination regularly cause you problems at work or in your studies
• Impulsive decisions keep recurring and lead to financial or family problems
• The ASRS or another questionnaire showed a high likelihood of ADHD
• Your child has been diagnosed with ADHD, and you recognize yourself in their difficulties
• Attention problems come together with anxiety, depression, or alcohol use

Questions and answers

Reviewed by

Assel Omarova, MDPsychiatrist and addiction specialist

Addiction combined with depression and anxiety, crisis states, online consultations for families.