Acute radiation syndrome (ARS) is a serious health condition that occurs after a person is exposed to a high dose of ionizing radiation in a short period. Symptoms can appear within hours or days and may include nausea, vomiting, fatigue, and skin burns. The severity of ARS depends on the radiation dose received. Treatment for ARS focuses on managing symptoms and preventing infections. Medical professionals may provide supportive care, such as fluids and medications, to help the body recover. In severe cases, treatments like bone marrow transplants may be necessary to restore blood cell production.