what is the definition of pyelonephritis
Your kidneys are your bodyâs filters. These two bean-shaped organs are a sophisticated waste removal system. Your kidneys process 200 quarts of blood per day and remove 2 quarts of waste products and excess water. Acute nephritis occurs when your kidneys suddenly become inflamed. Acute nephritis has several causes, and it can ultimately lead to kidney failure if itâs left untreated. There are several types of acute nephritis: In interstitial nephritis, the spaces between the kidney tubules become inflamed. This inflammation causes the kidneys to swell. Pyelonephritis is an inflammation of the kidney, usually due to a bacterial infection. In the majority of cases, the infection starts within the bladder and then migrates up the ureters and into the kidneys. Ureters are two tubes that transport urine from each kidney to the bladder.