Radiation poisoning occurs when a person is exposed to high levels of ionizing radiation, which can damage cells and tissues in the body. This exposure can happen through accidents, such as nuclear disasters, or through medical treatments that use radiation. Symptoms may include nausea, vomiting, fatigue, and skin burns, depending on the level and duration of exposure. The severity of radiation poisoning is often classified into different stages, ranging from mild to severe. In extreme cases, it can lead to long-term health issues, including cancer and other serious illnesses. Immediate medical attention is crucial for those affected to manage symptoms and reduce further damage.