1. What is hyperactivity in children? ADHD in children, also known as attention deficit hyperactivity disorder (ADHD), is a common neurodevelopmental disorder. Children with the disorder display behavioral characteristics such as inattention, impulsivity, and hyperactivity. 2. What are the causes of hyperactivity in children? 1. Genetic factors: Children with a family history are more likely to develop ADHD. 2. Environmental factors: including pregnancy environment and early life environment