Attention Deficit Hyperactivity Disorder - Attention Deficit Hyperactivity Disorder (ADHD) is one of the most common non-disturbance disorders of children and adolescents. The main symptoms pointing to ADHD are childhood hyperactivity, impulsiveness and lack of attention. Frequency estimates are different, ranging from 2% to 7% in school children four to five times more often in boys. In boys there is hyperactivity and impulsivity, while girls have more difficulty in maintaining attention. Therefore, the difficulties of a girl later identified, and that they denied the timely treatment. Thoughts about the deficit of attention/hyperactive disorder during historical development depended on the dominant scientific directions of the age in which it is estimating the problem. As the most common causes are mentioned: brain damage as a result of the different causes of the unfavourable conditions of development, social, emotional problems of children and inheritance. The basic characteristics of children who have been diagnosed with ADHD are restlessness, the need for activity and movement. ADHD children differ from other children in the school (they turn around, get up, they tease other children, not concentrate on work, other things take them away from the concentration - dangers, drops of gums etc.). The aim of this paper is to describe the above disorders and highlight the importance of understanding and acceptance of children who have it. The main role in the acceptance of thoose kids in the school have teachers and stresses the importance of their competencies for working with this highly sensitive social population.