The symptoms of ADHD include inattention, hyperactivity, and impulsivity. Inattentive children are disorganized and easily distracted. They have a hard time keeping their mind on a task, and get bored quickly. Hyperactive children are always in motion. They can't sit still, and they touch everything.
Impulsive children have difficulty waiting for things.
They may grab a toy from another child, or may hit another child when they are upset. Although children can show signs of ADHD at an early age, a diagnosis is usually not made until they start school. This is because the symptoms may be more apparent in the classroom. The diagnosis of ADHD can be made by using well-tested diagnostic interview methods. Diagnosis is based on history and observable behaviors in the child's usual settings.