ADHD
US /ˌeɪ.diː.eɪtʃˈdiː/
UK /ˌeɪ.diː.eɪtʃˈdiː/

1.
Attention-Deficit/Hyperactivity Disorder, a neurodevelopmental disorder characterized by inattention, hyperactivity, and impulsivity.
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Children with ADHD may struggle with focus in school.
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Early diagnosis of ADHD can help in managing symptoms.