Pyelonephritis has a certain relationship with sexual life. Pyelonephritis is an infectious disease mainly caused by bacterial and other pathogens, and its infections are mainly upward and bloodstream infections, in which upward infection and sex have a certain relationship. Sex can damage the mucous membrane of the urinary tract, especially women’s urinary barrier will be damaged due to frequent sex, if you don’t pay attention to hygiene, it will lead to a variety of bacteria with the ureter upstream to the renal pelvis, which will lead to pyelonephritis. Therefore, women need to wash their genitals thoroughly before having sex, and if pyelonephritis occurs every time after having sex, they need to take a small dose of antibiotics, such as furaztoxin, as prescribed by the doctor before having sex to prevent it.