Pyelonephritis and pyelitis are two inflammatory diseases that affect the kidney. Pyelitis is a state of the kidney where the renal pelvis is caused to experience an inflammatory change in the lining. In contrast, Pyelonephritis is an inflammatory infection that affects the renal pelvis and the main part of the renal tissue, like the calyces and parenchyma.
Pyelitis, which is an inflammation of the renal tissue, is usually caused by bacteria infection, it spreads from the urethra through to the urinary tract. When the symptoms of this infection are being neglected, then it will spread through to the deeper renal tissues, it then affects the parenchyma and calyces, which later leads to Pyelonephritis. Pyelonephritis starts being infected as the infection of the lower urinary tract, majorly bladder, or cystitis inflammation. This disease can also be caused by kidney stones obstructing urine outlet, vesicoureteral reflux, enlarged prostate, kidney tuberculosis, and more.