Which ARS syndrome includes fever, lethargy, and anorexia?

• A. Gastrointestinal syndrome
• B. Hematopoietic syndrome
• C. Cerebrovascular syndrome
• D. Neural syndrome

Answer: (B)

Acute Radiation Syndrome presents differently depending on the dose, and this set of symptoms points to damage of the hematopoietic (bone marrow) system. When radiation primarily suppresses the bone marrow, white blood cells drop, fatigue and malaise set in from anemia, and fever can arise due to increased infection risk. Lethargy and anorexia are common as the body’s systems slow down under immune suppression and systemic stress.

Gastrointestinal syndrome, by contrast, is driven by damage to the mucosal lining and would show vomiting, diarrhea, and dehydration. Neurovascular (or neural) syndrome involves severe neurological and cardiovascular symptoms and occurs at much higher doses. So the fever, lethargy, and anorexia pattern fits hematopoietic syndrome.