Adult ADHD Diagnoses Surge Multi-Fold: Scientists Explain the Phenomenon

International medical studies have recorded an unprecedented surge in attention deficit hyperactivity disorder (ADHD) diagnosis rates among adults. According to a research review on the PsyPost portal, over the past twenty years, the rate of initial diagnoses and accompanying prescription medication orders for adults has increased several times over, and in certain age groups — by dozens of times.

Medical statistics disprove the outdated stereotype that the disorder occurs exclusively in childhood.

Adult Patients Overtake Children in Prescriptions

UK data shows particularly strong dynamics: an analysis of records from 7.7 million patients revealed that between 2000 and 2018, the rate of new diagnoses among men aged 18–29 jumped 20-fold, while prescription medication rates rose 50-fold. Among women, the figures increased 15-fold and 20-fold, respectively.

According to reports from NHS England, adult patients have overtaken children in prescription drug therapy volume for the first time: in 2025/26, approximately 267,000 adults received specific medications, compared to 158,000 minors.

Global Statistics and CDC Data

An international analysis of medical histories for 154.5 million people across 13 countries confirmed a synchronized trend in Europe, North America, and Asia. In Japan, the number of newly diagnosed cases among people over 19 grew 21-fold over nine years.

According to the US Centers for Disease Control and Prevention (CDC), about 15.5 million American adults (roughly 6% of the population) had a confirmed ADHD diagnosis in 2023, with half seeking professional help for the first time as adults.

Key Drivers: DSM-5 Revision, Destigmatization, and TikTok

Neurologists and psychiatrists emphasize that this is not a new biological epidemic, but rather an explosion in detection rates for a condition that previously went unrecognized.

Key drivers behind the growth include:

• 2013 update to the DSM-5 manual: criteria were adapted for adult symptoms and allowed concurrent diagnosis with autism spectrum disorders (ASD);
• Improved detection in women: doctors learned to diagnose hidden forms of the disorder that lack classic physical hyperactivity;
• Reduced stigma: the expansion of telehealth simplified scheduling appointments with specialists.

Popularization across social media played a significant role. Videos on TikTok and YouTube helped millions realize that issues with focus, procrastination, and executive function can have a neurobiological origin.

However, authors of a study in JAMA Network Open warn against self-diagnosing through short videos: similar symptoms can stem from depression, anxiety disorders, or chronic stress, requiring a differential clinical evaluation.