Radiation sickness, also known as acute radiation syndrome, occurs when a person is exposed to a high dose of ionizing radiation in a short period. This exposure can damage cells and tissues, leading to symptoms such as nausea, vomiting, fatigue, and hair loss. The severity of symptoms depends on the amount of radiation absorbed and the duration of exposure. Treatment for radiation sickness focuses on reducing symptoms and supporting the body's recovery. Medical professionals may provide supportive care, such as fluids and medications, to help manage symptoms. In severe cases, treatments like bone marrow transplants may be necessary to restore the body's ability to produce blood cells.