How Common Is Inattentive ADHD? 

Inattentive ADHD is a recognised subtype of attention deficit hyperactivity disorder, and it’s more common than everyone realises. Unlike the combined or hyperactive sub-types, inattentive ADHD goes unrecognised, particularly in adults (mostly females), where it is mistaken for anxiety, laziness, or just daydreaming. But how common is inattentive ADHD? The answer might surprise you. 

How Common Is Inattentive ADHD? 

ADHD occurs in about 5% – 7% of children and 2.5% – 4% of adults worldwide, as estimated by the World Federation of ADHD and other studies of epidemiology. Of those with the disorder, it is estimated that about 30% – 50% have inattentive type. So millions might have inattentive ADHD though many remain undiagnosed. 
 
Since inattentive symptoms are not as apparent and tend to be internal, actual prevalence could be even higher. Individuals with inattentive ADHD are often never evaluated if they do well at school or in the workplace but quietly struggle with attention, forgetfulness, or being overwhelmed. 

Who Has Inattentive ADHD? 

Children: Those with inattentive ADHD are dismissed as unmotivated, distracted, or shy instead of being recognised as having a neurodevelopmental disorder. 
 
Adults: Most aren’t diagnosed until adulthood, usually after years of struggling to manage time, concentrate, or underachievement. 
 
Women: Girls and women are particularly underdiagnosed. Their symptoms are more likely to be confused with anxiety or depression because they are less disruptive. 

Why It’s Often Missed 

Traditional ADHD diagnosis in the past has essentially emphasised hyperactive behaviours  such as fidgeting, impulsiveness, or being loud. On the other hand, inattentive ADHD can manifest with internalised symptoms such as daydreaming, mental confusion, or disorganisation. These are simpler to ignore and don’t necessarily result in classroom or work disruptions, which can result in delayed or missed diagnosis. 

How to Find Out if You Have Inattentive ADHD 

An accurate diagnosis can provide clarity, support, and access to quality-of-life-enhancing tools. If you believe you might have inattentive ADHD, begin with a free online ADHD self-test. Free ADHD Self Assessment 
 

In the UK, diagnosis is possible through the NHS or privately. Diagnosis through the NHS is free but can entail lengthy waiting times. Private clinics provide quicker assessments, although fees can vary.