Urinary tract infections typically affect the bladder, but they often spread and cause infection in the kidneys, according to the National Kidney Foundation. Symptoms include pain in the back, frequent urination and fever.
Pyelonephritis, or kidney infection, is a type of urinary tract infection and requires medical attention, according to Mayo Clinic. It's caused when bacteria form in the urinary tract and progress through the bloodstream to the kidneys. A kidney infection can lead to permanent kidney damage.
Many kidney diseases, including urinary tract infections, are successfully treated, reports the National Kidney Foundation. Cases that result in kidney failure are often treated through kidney transplant and dialysis.