Probability of Having ADHD as an Adult

Attention-deficit/hyperactivity disorder (ADHD) affects approximately 4.4% of American adults (about 11 million people), according to National Comorbidity Survey data. However, many experts believe the true prevalence may be higher due to underdiagnosis, particularly in women and minorities.

ADHD was once thought to be exclusively a childhood condition, but research shows that about 60% of children with ADHD continue to have significant symptoms into adulthood. In adults, hyperactivity often manifests as restlessness rather than the overt physical hyperactivity seen in children, while inattention and executive function difficulties tend to persist or worsen.

Adults with ADHD are more likely to experience job instability, relationship difficulties, financial problems, and motor vehicle accidents. ADHD also frequently co-occurs with anxiety, depression, and substance use disorders. Treatment typically involves stimulant medications (which are effective in about 70-80% of adults), cognitive behavioral therapy, and organizational strategies. Adult ADHD diagnosis has increased significantly in recent years as awareness has grown.