In this self-certification sickness form, you should provide details of why you were not able to attend work. For example, because you were suffering from food poisoning or because you had a prolonged fever. Simply stating that you were sick is not enough. If you were off because of an injury (eg a broken bone or badly twisted ankle), you should provide details of the injury. If you were injured at work this should have been reported and logged in your workplace accident book. If you were injured or became sick because of a workplace accident or illness, you may also be able to claim Industrial Injuries Disablement Benefit.