Nephritis's inflammation of the kidney. The word comes from the Greek nephro- meaning "of the kidney" and -itis meaning "inflammation". Nephritis's often caused by infections, toxins, and auto-immune diseases. Subtypes glomerulonephritis's inflammation of the glomeruli. (Often when the term "nephritis"'s used without qualification, this's the condition meant.) interstitial nephritis or tubulo-interstitial nephritis's inflammation of the spaces between renal tubules. pyelonephritis's when a u… (More on Nephritis)