Stigmatization of mentally disordered people began for back in time. In ancient history mentally disordered people were thought to be possessed by the devil and evil spirits and they werw therefore subjected to very cruel methods like trephination and putting into chains. The development of scientific psychiatry in the 19th century brought significant improvement in treating mentally disordered. Philippe Pinel (1745.-1826.), a French psychiatrist, introduced a more humane approach in treating such patients by releasing them from chains and shackles. Unfortunately, even though cruel methods have been abandoned, the attitude and prejudice haven't changed much. The widespread opinion of mentally disordered people as being bad people prone to criminal actions, lunatics and maniacs who should be feared of and avoided still lingers on today. Due to this and similar bias mentally disordered people have the stigma of mental disorder and are therefore often subjected to discrimination from almost everyone. The stigma of mental disorder significantly impairs the life of the person but also af the whole family which often leads to impaired relations within a family. They are also often left unemployed and without friends. Stigmatization also leads to self-stigmatization. It is believed that the bias and negative attitudes mostly come from ignorance and fear towards mental disorders and the suffered. The education in all levels of society is therefore needed to inhibit and prevent the stigmatization. In the first place it is necessary to educate the patients and members of their families as well as experts, professionals and people involved in the treatment in order to cope more easily with the problem of stigmatization and to spread knowledge of mental problems and disorders in the society trough attitudes and behaviour. Psychoeducation has a great role in this process by giving information on the disorder, causes, symptoms and the treatment, but it also significantly effects the reducing of stigmatization and self-stiggmatization by working on the change of negative attitudes and bias.