Any illness caused or aggravated by a person's job.

Caused by exposure to energies, materials or processes beyond our bodies' tolerance limits e.g. asbestosis, liver damage, chronic back pain caused by continuous lifting, white-finger disease from excessive vibration, occupational overuse syndrome (RSI). Occupational illnesses sometimes take a long time to develop and it is not always easy to lay the blame solely with the employer as many illnesses are caused by more than one event - for example, cancer, loss of sight.

An ill health condition caused by exposure to a health hazard in the workplace. May also be called industrial disease

means any abnormal condition or disorder caused by exposure to environmental factors associated with employment. For excavations this might include illnesses caused by the inhilation of toxic vapors

is any abnormal condition or disorder, other than one resulting from an occupational injury, caused by exposure to environmental factors associated with employment. It includes acute and chronic illnesses or diseases that may be caused by inhalation, absorption, ingestion, or direct contact.

a condition that results from the exposure in a workplace to a physical, chemical or biological agent to the extent that the normal physiological mechanisms are affected and the health of the worker is impaired, and includes an industrial disease as defined by the board;