ADHD in the Workplace: The Complete Guide for Employees and Employers

Introduction

Attention Deficit Hyperactivity Disorder (ADHD) affects an estimated 5–7% of children and 2.5–4% of adults worldwide (Faraone et al., 2021 World Federation of ADHD International Consensus Statement). In the UK, the estimated adult prevalence is 3–4%, meaning approximately 1.5 million working-age adults have ADHD — most undiagnosed. In the US, the CDC estimates 4.4% of adults have ADHD, approximately 10 million people.

ADHD is a neurodevelopmental condition affecting executive function: the brain's management system for attention, working memory, impulse control, emotional regulation, time perception, and task initiation. It is not a lack of willpower, laziness, or a character flaw.

ADHD Subtypes and Workplace Impact

Inattentive Type (formerly ADD)

• Difficulty sustaining focus on tasks perceived as unstimulating
• Easily distracted by environmental stimuli or internal thoughts
• Difficulty following through on instructions and organising tasks
• Frequently losing materials, missing deadlines, forgetting appointments

Hyperactive-Impulsive Type

• Restlessness, difficulty sitting still for extended periods
• Talking excessively, interrupting colleagues