Radiation-related illnesses occur when the body is exposed to high levels of radiation, which can damage cells and tissues. Common illnesses include radiation sickness, characterized by symptoms like nausea, vomiting, and fatigue. Long-term exposure can lead to serious conditions such as cancer and thyroid disorders. The severity of radiation-related illnesses depends on the dose and duration of exposure. Occupational exposure in industries like nuclear power or medical imaging can pose risks. Protective measures, such as lead shielding and monitoring, are essential to minimize these health risks for workers and the public.