The book presents in an accessible form all the main issues related to one of the most widespread diseases of mankind - pyelonephritis. The reader will learn what pyelonephritis is and why it occurs; what modern methods of diagnosis and treatment of this disease exist; what needs to be done to prevent the occurrence of acute and chronic pyelonephritis; what folk remedies are used in treatment. It contains the most reliable and up-to-date information that corresponds to the authoritative recommendations of foreign and domestic medical associations and verified by the author’s many years of experience.