Some children and adults with ADHD find it difficult to concentrate on tasks at school or work and may daydream frequently. Children with ADHD may become disruptive, defiant, or have trouble getting along with parents, peers, or teachers. Children who struggle with hyperactivity and impulsivity, in particular, often have behavioral challenges that can be difficult for adults to manage.
Adults, on the other hand, may be more likely to report feeling restless or fidgety; if they struggle with impulsivity, they may make rash decisions that adversely affect their life. For both children and adults, executive functioning (planning, emotional regulation, and decision-making) is often affected as well. Many children and adults display either hyperactive or inattentive symptoms of ADHD, but it’s also possible for both sets of symptoms to exist together, in what is typically called combined type ADHD.
For more on symptoms, see ADHD Symptoms and Diagnosis.