1. Kidney infection
Truth be told, a kidney infection is a urinary tract infection (UTI). After all, the kidneys are part of the urinary system, along with the urethra, the bladder, and the ureters.
This means that, although we commonly use the term UTI to refer to lower urinary tract infections (urethra infection and bladder infection – the most frequently diagnosed forms of UTI), it can actually be used to refer to an infection in any part of the system.
So, to put it simply, a kidney infection occurs when the E. coli bacteria, responsible for a lower urinary tract infection, finds its way into one of the kidneys (or both) via the ureters. This is by far the main reason for kidney infections.
However, it is not the only one. It can also happen after kidney surgery or due to an infection in another part of your organism if the bacteria spreads to the kidney through the bloodstream. Because they have a shorter urethra, women have a higher risk of developing kidney infections.