The impact of a specific stressful event on the mental health of workers was investigated by using two methods of stress measurement, and by the assessment of coping using life event scores, as well as by measuring negative cognition in that situation. Participants (n=240, 137 men and 103 women) were asked to select the most stressful event they had experienced from a scale of life events pertaining to workers. Participants were also asked to rate the frequency of coping, and their own mental health during that period. Although the life event score was not related to mental health, negative cognition in the stressful event showed a positive correlation with mental health. To explain the impact of stress on mental health, multiple regression analyses were conducted. In men, the impact of negative cognitions upon the event, and coping predicted mental health. In women, in addition to these two variables, mental health was also predicted by life event scores.