Based on the census of the World Health Organization the prevalence of mental disorders is increasing in developing countries, while in the social and economic planning the lowest attention is conferred upon these disorders. Hence a research with the objective to investigate the mental health of the working staff in the petrochemical company of Ilam in 2013 was carried out. The current paper is among the comparative-descriptive causal researches. The statistical population of this study

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... all the staff working in the petrochemical company of Ilam which adds up to 510 people. The sampling was carried out using the random sampling method. The sample size was determined based on Morgan's table to be 171 participants and they were presented with a questionnaire. Based on the obtained results it was shown that economic status and stress-inducing factors exerted a significant impact on the general health of the participants and they were interrelated. Moreover the results also showed that other research variables did not have a significant impact on general health or their impact is negligible.