4Meaning of injury

4 Meaning of injury injury means a physical or mental injury (including stress), and includes aggravation, acceleration or recurrence of a pre-existing injury. mental injury (including stress) does not include a mental injury (including stress) completely or mostly caused by reasonable action taken, or proposed to be taken, by or on behalf of an employer in relation to the transfer, demotion, promotion, performance appraisal, discipline, retrenchment or dismissal of a worker or the provision of an employment benefit to a worker.