Pls what's meant by septicemia and flank pain?

Infection : Septicemia is an old term that usually means bacteria in the blood. The updated term is sepsis, which is an overwhelming maladaptive of the body's immune system to an infection. It may cause end organ damage leading to cardiovascular collapse and death. Flank pain denotes pain around the two sides of your lower back. Kidney infection usually cause pain in that area.