This research was conducted to understand the influence of work related stress on the performance of school teachers in the state of Kerala. Data were collected from a sample of 308 teachers working in various Government, Aided and Unaided schools, affiliated to the State Board or CBSE or ICSE. Teachers from Pre-Primary, Primary and Secondary Sections were included in the survey. Survey was conducted using questionnaires, seeking information on the socio educational background, job details, opinion on the current organization, self assessment of their personality, work ethics, expectation on work life balance, compensation, job satisfaction, Student teacher relationship, teaching style etc. The study reveals that stress has an adverse role on the performance of teachers. Researchers believe that the study would help the authorities concerned, in understanding the working conditions, job expectations and preferences of the teachers and the various factors that contribute to their occupational stress and the impact of stress on their performance.