Many diseases are the result of health hazards arising from occupations. These hazards can come from chemicals, noise, radiation, bacteria, viruses and equipment not designed with ergonomics in mind. Most occupational diseases have no apparent signs in their early stages. Treatment is often delayed resulting in long painful suffering by workers. Some occupational diseases can cause permanent damage and others may be fatal. This course introduces the health hazards present in working environments, and discusses risk assessment and control methods.