What causes body aches with influenza?

Answer:

When your body is invaded by things like a virus, the immune system sends out white blood cells (also called leukocytes) to find the infection. The white blood cells release a chemical called cytokines, which is what causes the joint pain seen not just in the flu but with many inflammatory/autoimmune conditions like arthritis, lupus, inflammatory bowel disease, etc.

First answer by ID2720510978. Last edit by ID2720510978. Question popularity: 16 [recommend question].