ADHD - Attention deficit/hyperactivity disorder is one of the most common neurodevelopmental disorders of childhood and adolescence. It is a disorder characterized by hyperactivity, impulsivity and lack of attention. The cause of the disorder has not yet been discovered, but it is known that the heredity influence plays a major role. The diagnosis is made based on the recommendations of the Diagnostic and Statistical Manual of Mental Disorders (DSM-V) and the International Classification of Diseases and Related Health Problems (ICD-10). In order for the disorder to be diagnosed, the symptoms must appear before the child's seventh year of life and last at least six months. They must also be more intense than in children of the same age and developmental level. Many specialists participate in diagnosing and treating ADHD with the cooperation of parents, teachers or educators. The best results in the treatment of children with ADHD are achieved with the simultaneous use of appropriate drugs and various psychosocial and psychoeducational approaches. The paper describes and explains treatment procedures and emphasizes the importance of educating parents and the environment about the nature of the disease, in order to adapt better to the child. Ignoring this disorder, as well as the absence of optimal treatment, has devastating consequences on the child's development, hindering his education and formation into a healthy social being. By providing adequate help and taking into account the child's strengths and weaknesses, family, educators and experts can together ensure that a child with hyperactivity disorder is able to lead a happy and successful life.