If the body is infected with bacteria that cause fever, it is caused by several factors: First, the most common is that bacteria contain inflammatory mediators, such as bradykinin, leukotrienes, tumor necrosis factor, prostaglandins, interleukin-6, interleukin-4, which cause endogenous thermogenesis in the body after entering the bloodstream, and the endogenous thermogenesis will cause the body to have a febrile response. Second, when bacterial infection is also known as inflammatory infection, the hypothalamic temperature center will shift upward, which will increase the body’s heat production and decrease heat dissipation, so a febrile response will occur at this time. Third, when bacterial fever is present, it can lead to abscesses in the organs, such as liver abscesses and lung abscesses, and the body will have a significant fever and fever at this time.