Mental disorder is a disease with psychological or behavioral manifestations associated with impaired functioning due to biological, social, psychological, genetic, physical and chemical interference. It is defined as a deviation from a normative concept. Mental patients from the beginning of civilization had a special, certainly inferior social status. The attitude towards mentally ill person is still slowly changing. Mental illness often arouses fear in people, public aversion to the mentally ill and there are still negative attitudes toward psychiatry. Mental patient often has no insight into his condition. He does not realize that he is ill and he refuses the treatment. If the mental patient is dangerous to himself or to the environment because of his illness, he needs to be hospitalized against his will. Compulsory hospitalization is regulated by legislation (Protection law of Persons with Mental Disorders). Health care of psychiatric patients go beyond simple practical skills. The nurse is included in the general program for the improvement of mental health. She helps the individual to develop healthy lifestyles, countering stress and frustration, developing self-esteem and self-confidence, she actively participates in educational work for the prevention of mental disorders, she is actively involved in the process of a complete and effective treatment (which can not be imagined without adequate health care) and assists the elimination of the consequences of mental illness and full recovery.