An epidemiologic survey performed in France in 1990 allowed us to analyze the epidemiologic characteristics of adjustment disorders (AD). AD were defined according to the DSM III-R guidelines. AD are strongly correlated to personality disorders. The study population was young (mean age: 39 years) and predominantly female (60.3%). Marriage or life with a partner, living in the country or in small towns, liberal profession and a high level of schooling are the most significant social and demographic characteristics that emerge from this study. These patients tend to have multiple medical contacts, seeing many doctors but consuming little medication (25% of them). Comorbidity with associated personality disorders (15%) and dependency behaviors (alcohol, drugs) are frequent (9.3%), although no causative link was found between these disorders. Alcoholism may have a tendency to protect against AD. There is no seasonal factor. The patients mostly see private physicians; their geographic distribution is the inverse of the distribution of alcoholism. Numerous social and demographic risk factors for AD were found. Among the personal psychiatric history, disorders of feeding behavior and early adjustment problems were prominent. The family history often shows the existence of mental disorders in the parents. The treatment history points to a lesser consummation of psychotropic drugs, mostly limited for two classes, i.e. antidepressants (50%) and tranquilizers (40.9%), although a different pattern of behaviour was found according to the clinical types of AD. The present therapeutic approach is recent and based on psychotherapy. It differs little according to the clinical forms, with the possible exception of co-prescribed medication. This study has thus allowed us to observe the epidemiologic characteristics of AD. Adjustment disorders appear to be frequent, but their particularities do not differentiate them significantly from other types of mental disorders.