Does your child have trouble sitting still or paying attention? You may have been told that ADHD (attention-deficit hyperactivity disorder) may be the cause. A child with ADHD might have a hard time staying focused (attention-deficit). They may also have trouble controlling impulses (hyperactivity disorder). ADHD symptoms like these can interfere with school, work, and other activities. They can also strain social relationships. ADHD is one of the most common brain-related disorders in children. It is also no one's fault. But if it's not treated, it can hurt a child's confidence, make it hard to make friends, and affect how well they do in life. Effective treatment is available.