This study examined the incidence and nature of general psychopathology among Nigerian shift workers. Three hundred and twenty subjects of both sexes were randomly selected from establishments running one type of shift or the other in Benin City, Nigeria. The Awaritefe Psychological
Index (API) (Awaritefe, 1982) was used in the study. The data were analysed by 4 x 2 x 2 A NOVA supplemented Scheffe's orthogonal test of comparison. The shift workers were found to be more significantly psychopathological than the non-shift workers (p < 0.001). The prominent disorders
found among the shift workers were intellectual, sleep, mood, and general somatic disorders. No significant difference could be attributed to sex and marital status of subjects. The relevance of the findings and their possible clinical implications are discussed. Recommendations for employers
of shift workers and suggestions for future research are also made.