Occupational health and safety is concerned with the safety, health and welfare of employees at work. The ILO Constitution establishes the principle that ‘workers must be protected from sickness, disease and injury arising from their employment’. Yet the reality is often very different. The ILO estimates 2.78 million work-related deaths are recorded every year, of which 2.4 million are related to occupational diseases. An occupational disease is caused by the work environment or work activities. The International Labour Organisation (ILO) has published a list of occupational diseases in 2010.