Based on clinical assessment of the case histories, the results of a retrospective suicidal research of 66 patients between the ages of 15 and 25 years who were hospitalised in Psychiatric University Hospital in Lublin between 1990 and 1997 were presented. In the paper the analysis was performed of clinical and sociodemographic aspects, significant from suicidal point of view, such as: the psychiatric diagnosis, reasons for suicidal attempts, the means of realization of the suicidal attempts, somatic conditions, alcohol and substance abuse, months of suicidal attempts, months of hospitalisations, duration of hospitalisation, repetition of suicidal acts, suicidal family history, negative interactions in family system, gender, current occupation, education, and marital status. In the examined group, six main reasons of suicidal attempts were selected, such as: 1) delusions (28% patients of the whole group), 2) hallucinatory behaviour (16% patients), 3) situational disorders (17% patients), 4) acute reactions (17% patients), 5) insight disorders (17% patients), 6) depressive disorders (11% patients). The differences between the psychotic group (with a prevalence of males) and the non-psychotic group (with a prevalence of females) proved to be significant. When taking into account the method of the suicide, there was a marked difference between the group of males (prevalence of "hard" methods, mainly hanging themselves) and the group of females (prevalence of "soft" methods, mainly drug intoxications). In the majority the families, systems of mutual interactions were disordered. The exacerbation of suicidal acts was registered in autumn-winter period. Psychoactive drug abuse was a malignant predictor of suicidal behaviour (mainly among males).