High SAA and CRP are usually caused by bacterial infection, which indicates the presence of inflammation in the body. Antibacterial and anti-inflammatory treatments can be given to clarify the cause of the disease. 1. CRP, or C-reactive protein, is a time-phase reaction when there is an acute infection, and usually reaches a higher elevation index within one or two days, which is a sensitive indicator for identifying bacterial infections and viral infections. In bacterial infections, CRP can rise rapidly, and after the symptoms of infection are eliminated, its level will drop to normal in about a week, but CRP is usually not elevated in viral infections. 2. SAA, serum amyloid, is also an acute time-responsive protein, which can be synthesized in the liver and is used clinically to assess the course of acute inflammation. When the body is infected by viruses, fungi, mycoplasma and other infections, SAA can start to rise in a few hours, especially in viral infections, and when the infection is treated and recovered, SAA can quickly return to the normal level, which is a relatively sensitive indicator parameter, and can be widely used to assist in screening and diagnosis of certain infectious diseases. When SAA and CRP are combined, it can help identify bacterial and viral infections. When both are elevated, it is recommended to go to the hospital in time for diagnosis and treatment by a medical professional.