ADHD is a medical condition that affects attention, focus, and impulse control. It is diagnosed when symptoms of inattention, hyperactivity, and impulsivity are persistent for at least 6 months. Diagnosis involves evaluating symptoms, history, and ruling out other potential causes. While the exact causes are unknown, genetics and environmental factors during development likely play a role. Treatment typically involves medication, behavior therapy, or a combination to help manage symptoms at home and school. Medications can reduce hyperactivity but have potential side effects, so behavior techniques are often recommended initially to teach new strategies.