Pyelonephritis is a bacterial-based kidney disease. In connection with the occurrence of this disease, inflammatory processes begin to occur in the human body, most often affecting one kidney. It can proceed in acute or chronic form, respectively, sometimes it is difficult to identify. Most often, women are exposed to pyelonephritis. This is due to another disease - cystitis, after which kidney problems begin to appear. Also, an infection of this kind can be caused by various accompanying bacteria, for example, E. coli. Microorganisms travel along the urinary tract, which connects the bladder and kidneys, and thus achieve their goal of locating the kidneys. And, of course, pyelonephritis affects people with reduced immunity, patients with diabetes mellitus, as well as those with a genetic predisposition to the disease or hormonal problems.