Document name

Occupational Disease

Document number

POL 04/2017

1. The definition of occupational disease requires two conditions to be met before it is considered an injury, as defined by The Workers’ Compensation Act, 2013 (the “Act”) (Section 2(1)(aa)):
   1. The disease or disorder must have arisen out of and in the course of employment, and
   2. Result from causes or conditions that are:
      1. Peculiar to or characteristic of a particular trade, occupation or industry; or
      2. Peculiar to a particular employment.
2. The Act provides a definition for “injury”, which includes a “disabling or potentially disabling disorder caused by an occupational disease” (2(1)(r)(iii)).
3. The Workers’ Compensation Board (WCB) has exclusive jurisdiction to examine, hear and determine all matters arising pursuant to the Act (Section 20). This includes:
   1. Whether any condition or death with respect to which compensation is claimed was caused by an injury (Section 20(2)(a)), and
   2. Whether any injury has arisen out of or in the course of employment (Section 20(2)(b)).
4. The Act and The Workers’ Compensation General Regulations, 1985 (the “General Regulations”) provide conditions for the presumption of an occupational disease for firefighters. POL 28/2025, Injuries – Firefighters provides guidelines for cancer and cardiac claims for firefighters.
5. The WCB has established guidelines to determine a worker’s date of injury for both acute and delayed onset injuries (POL 04/2013, Date of Injury).

1. In all cases, the WCB establishes if an injury is work-related by determining if it arose out of and in the course of employment (POL 16/2025, Arising Out Of and In The Course Of Employment)
   1. An injury arises out of employment if it is the result of an activity that is reasonably related to, originates from, or is the result of the worker's employment.
   2. An injury occurs in the course of employment when it happens in a time and place linked to employment and if the worker is performing an activity that is reasonably related to, originates from, or is the result of the worker's employment.
2. The WCB will obtain all available information when determining if a disease or disorder arose out of and in the course of employment.
3. The WCB makes decisions on the real merits and justice of each case and decisions are not bound to follow any legal precedent. If evidence in support of both sides of an issue is approximately equal, the WCB will resolve the issue in favour of the worker (POL 02/2019, Decision Making).
4. In addition to the following general guidelines, the WCB has established specific guidelines to determine if a disease or disorder is an occupational disease (As per the appendices attached to PRO 04/2017, Injuries – Occupational Disease).

General Guidelines

5. The WCB considers if a worker’s disease or disorder was the result of exposure to a harmful substance (e.g., asbestos or silica) during employment or because of performing activities for the purpose of their employment.
6. Exposure to a harmful substance (e.g., asbestos fibres) in the workplace should be reported to the WCB, even if the worker does not initially experience symptoms, seek medical attention or experience earnings loss past the day of exposure.
7. Exposure or employment activities may result in a worker developing a latent occupational disease. The cause and effect link between the exposure and disease is either known at the time of exposure, or unknown at the time of exposure but a link has since been established through scientific evidence.
8. A disease or disorder is typically the result of numerous exposures, but may also be the result of a single, usually traumatic exposure, where the cause is easily identified.
9. A disease or disorder may be the result of both work and non-work causes (e.g., medical conditions, hobbies and exposure in employment not covered by the Act). The WCB will determine claim acceptance based on the degree of exposure or the effect on the disease or disorder by both.
10. Pre-existing conditions accelerated or aggravated due to a work-related exposure or disease or disorder will be considered under POL 12/2017, Pre-Existing Conditions – Aggravation or Acceleration.
11. Even if there is a presumption for an occupational disease provided by the Act and the General Regulations, all claims require full file development to determine if it arose out of and in the course of employment.

Permanent Functional Impairment

12. If an accepted occupational disease claim results in a measurable permanent functional impairment, the worker may be eligible for a Permanent Functional Impairment award as outlined in the Permanent Functional Impairment (PFI) Awards policy.

Cost Relief

13. Employers may be eligible for cost relief as per POL 03/2021, Second Injury and Re-employment Reserve or POL 17/2023, Occupational Disease – Cost Relief.