Determining if someone has ADHD (Attention-Deficit/Hyperactivity Disorder) cannot be done through an online conversation alone; it requires a professional evaluation. ADHD diagnosis involves a process where a healthcare provider, such as a psychologist, psychiatrist, or primary care doctor, assesses symptoms that have persisted for at least six months and interfere with functioning or development. Symptoms include inattention, hyperactivity, and impulsivity, and these must be inappropriate for the person's developmental level and present across multiple settings (e.g., home, work, school). If someone suspects they have ADHD, the best step is to consult a healthcare professional who can perform a thorough assessment considering symptom history, their impact on life, and possible alternative explanations like anxiety or depression. Self-assessment quizzes and screenings exist and can guide whether to seek professional advice but are not definitive or diagnostic by themselves. In summary, only a qualified healthcare provider can determine if someone has ADHD based on clinical criteria and a careful assessment of symptoms and history.