What are some common symptoms of acute radiation syndrome (ARS)?

Acute Radiation Syndrome (ARS) occurs after a person is exposed to a high dose of ionizing radiation over a short period of time. The symptoms of ARS typically manifest in distinct phases and are directly related to the severity of the exposure.

Nausea, vomiting, and fatigue are hallmark symptoms of ARS experienced soon after exposure. These symptoms are part of the gastrointestinal and hematopoietic syndrome that can occur when the bone marrow and the lining of the digestive tract are damaged by radiation. The onset of nausea and vomiting usually happens within a few hours, while fatigue is a persistent symptom that reflects the body's immediate response to the stress of radiation and the subsequent cellular damage.

The other options, while they may represent reactions to various conditions, do not specifically align with the immediate and characteristic symptoms that follow acute radiation exposure, which makes nausea, vomiting, and fatigue the most accurate choice in this context.