In the doctrinal corpus on access to justice, the question of the costs that are incurred by injured or sick workers, whether these costs are human or financial, remains rarely addressed. In Québec, it is the Act respecting industrial accidents and occupational diseases that sets the legal benchmarks for the compensation of occupational injuries. From an administrative point of view, this implementation will primarily involve the Commission for Standards, Equity, Health and Safety at Work (French acronym: CNESST); however, it is possible that the decision rendered by the CNESST be challenged, by the injured worker or by their employer. The compensation process for occupational injuries may therefore lead to legal proceedings. This research aims to place non-unionized injured workers at the heart of discussions on the compensation system for occupational injuries in Quebec and more particularly on the process of appealing the decision of the CNESST that may arise. We identified the costs of justice and tried to shed light on their effects, in order to see how injured workers deal with them throughout the appeal process. We thus wanted to illustrate this process which brings in its wake a series of elements that inhibit effective access to justice. Indeed, the costs borne by injured workers appear to us to be indicative of access to justice which will sometimes become illusory for some injured workers.