This is a protein that causes inflammation, a physical reaction to infection, injury or other causes.

VOA: special.2009.04.14

Other suspected causes include antibiotic drugs, mental or physical tension, infections and hormones.

VOA: special.2010.06.15

Running,walking or playing sports causes physical changes that make you feel better.

VOA: special.2009.03.24

Causes of stress can be physical, such as injury or disease.

VOA: special.2009.03.24