When was adhd first diagnosed?

Physicians described the ADHD pattern more than a century before it had a name

The question has two honest answers, depending on whether you mean the first description or the first official diagnosis. The first description is usually credited to Sir George Frederic Still, a British paediatrician who in 1902 presented a series of lectures to the Royal College of Physicians on children who showed what he called an abnormal defect of moral control. His cases were restless, inattentive and impulsive despite normal intelligence and ordinary upbringing, and he argued the cause was biological rather than a failure of discipline. That argument is why he is treated as the starting point of the modern story.

Still was not the earliest. In 1798 the Scottish physician Alexander Crichton published a chapter on attention in which he described a mental restlessness that made it hard for some people to attend to one thing with any constancy, noting that it was often present from early life and tended to ease with age. Nearly fifty years later the German physician Heinrich Hoffmann wrote the children's story of Fidgety Philip, a boy who cannot sit still at the dinner table, which is still quoted as an early popular portrait. Neither was a diagnosis, but both show that the behaviour was recognised long before psychiatry had a category for it. The broader story is told in our post on the history of ADHD.

ADHD became an official diagnosis in 1968 and reached its current name in 1987

Between Still's lectures and the first diagnostic manual entry, the condition passed through several names, each reflecting the theory of the day.

• 1917 to 1928. After an epidemic of encephalitis, physicians noticed that some recovering children developed lasting hyperactivity and impulsivity, which reinforced the idea that the pattern had a brain-based cause.
• 1937. The American physician Charles Bradley reported that a stimulant medication, given to children for another reason, unexpectedly improved their attention and behaviour. The observation shaped treatment for decades.
• 1950s and 1960s. The labels minimal brain damage and later minimal brain dysfunction were used for children with these difficulties, on the assumption of subtle injury that could not be seen.
• 1968. The DSM-II introduced hyperkinetic reaction of childhood, the first official diagnosis. The emphasis was on physical restlessness.
• 1980. The DSM-III renamed it attention deficit disorder, with or without hyperactivity, shifting the focus to attention and acknowledging children who were inattentive but not hyperactive.
• 1987. The DSM-III-R combined the forms into a single diagnosis, attention-deficit hyperactivity disorder, the name still used today.
• 1994. The DSM-IV defined the three presentations, predominantly inattentive, predominantly hyperactive-impulsive and combined.
• 2013 and 2022. The DSM-5 and its text revision, the DSM-5-TR, placed ADHD among the neurodevelopmental disorders and adjusted the criteria so that adults could be diagnosed more reliably.

The World Health Organization's classification followed a parallel path, using hyperkinetic disorder in the ICD-10 and adopting the name ADHD in the ICD-11. How the two systems now differ is explained in how do ICD-11 and DSM-5-TR differ in how they define ADHD?.

Adult ADHD was recognised much later, which is why many adults are only diagnosed now

For most of the twentieth century ADHD was considered a childhood condition that was outgrown by adolescence. Follow-up studies from the 1970s onward showed that was wrong: a large share of children with ADHD continued to have impairing symptoms as adults, even where overt hyperactivity had faded into inner restlessness. The DSM-IV in 1994 allowed an adult diagnosis in principle, but the criteria were written for children, with an onset requirement before age 7 and symptom examples about classrooms and playgrounds.

The DSM-5 in 2013 made the changes that opened the door to adult diagnosis as it exists today. The age-of-onset requirement moved from 7 to 12, which better matches how adults actually remember their childhood; the number of symptoms required for people aged 17 and over dropped from six to five in either domain; and the symptom descriptions gained adult examples such as returning calls, paying bills and keeping appointments. The current criteria are summarised in what does DSM-5-TR mean?.

In Canada, diagnosis follows the DSM-5-TR and national guidelines from CADDRA

Canadian clinicians diagnose ADHD using the DSM-5-TR criteria, supported by practice guidelines from the Canadian ADHD Resource Alliance, CADDRA, whose current edition is 4.1. Those guidelines describe assessment across the lifespan, set out which rating scales to use, and make clear that ADHD in adults is a legitimate and common diagnosis rather than a fashionable one. Physicians, psychologists and, in most provinces, nurse practitioners can make the diagnosis.

The practical consequence of a century of refinement is that the diagnosis now rests on a clear, structured process: a clinical interview that establishes symptoms before age 12, impairment in at least two settings, persistence for at least six months and the exclusion of better explanations. Finding Focus follows that process online for adults and teens in several Canadian provinces, with one video consultation with a licensed Canadian clinician after a short online intake, no referral needed, from $399.

One last point about the name. Many clinicians and researchers consider attention deficit a poor description, since the difficulty is regulating attention rather than lacking it, and the hyperactivity in the title is absent in a large share of adults. The name has survived because changing it again would disrupt research, records and law. If the label does not fit how your difficulties feel, that is a known limitation of the term, not evidence that the diagnosis does not apply.