Attention-deficit/hyperactivity disorder (ADHD), is a mental health condition that causes symptoms of inattention, hyperactivity, and impulsivity. Typically recognized in childhood, millions of children are diagnosed with ADHD every year. 

Attention-deficit/hyperactivity disorder, known as ADHD, is a mental health condition that causes symptoms of inattention, hyperactivity, and impulsivity. ADHD begins in childhood and is usually diagnosed early on in life. However, for some, ADHD may not be diagnosed until adulthood.