This research work was carried out to appraise Job stress and performance of employee in an organization. One of the organizational outcomes that are affected by occupational stress is performance. Employees’ performance can be viewed as an activity in which an individual is able to accomplish the task assigned to his/ her successfully, subject to the normal constraints of reasonable utilization of the available resources. The focus of this study is to appraise the cause of stress, the effect on employee performance, how workers identify those stress factors and react to the factors. The data of study was collected through the use of Primary and Secondary sources by administering questionnaires, personal interviews and information was extracted from relevant journals and statistical bulletins. The descriptive method was used to analyze the data with aid of frequency and percentage for the research objectives. From the findings it was discovered that work overload, career development and work/family conflict are considered to likely cause a disruptive effect on performance of workers. The study reveals that workers performance were affected by the following factors; tiredness, worry, unhappiness, weakness, headache, and anger. Based on the findings of this study, the study concluded that job stress has significant effect on employees’ performance.