C-reactive protein (CRP) is an acute phase protein with a structure of n-pentamers. It has good stability and accuracy, and is a nonspecific marker of inflammation and tissue injury. If the CRP value does not drop after treatment, there may still be damage. CRP can activate complement and enhance the phagocytosis of phagocytes to play a conditioning role, and plays an important protective role in the natural immune process of the body.