A child’s hyperactivity is not necessarily ADHD. Childhood hyperactivity syndrome, the most common behavioral psychological disorder of childhood, is characterized by age-inappropriate attention deficits and hyperactive impulsivity, which generally develops before the age of 7, and symptoms can persist into adolescence or adulthood. Diagnosing whether a child has ADHD requires a detailed medical history and psychological behavior assessment. ADHD in children starts before the age of 7 years, symptoms persist for more than 6 months, and the main manifestations are attention deficits and or hyperactivity, which must be present in more than one setting such as school home. Children with ADHD may have learning difficulties and conduct problems, but this is not required for a diagnosis of ADHD, and other disorders such as mood disorders, mental retardation, and childhood schizophrenia need to be ruled out as causes of hyperactivity. It is the nature of children to be active, and it is normal for a normally active child to be active in accordance with his or her age, developmental interests and environment, and to be quiet when he or she needs to be quiet. The core symptom of ADHD is attention deficit, which is a deficit in active attention, while passive attention can be normal or reinforced. In summary, children with ADHD are definitely hyperactive and impulsive regardless of the occasion. If a child can be quiet when he or she needs to be quiet, then this is normal. You should never say that a child is hyperactive just because he or she is active. Of course, if your child has hyperactive behavior regardless of the occasion, you can take your child to a hospital specialist for a diagnosis before deciding on a treatment plan.