Acute interstitial nephritis is also called AIN. AIN is a condition in which there is damage to the tissue around the filtering unit of the kidney. This can result in a sudden decline in the kidney function.
In AIN, different types of white blood cells invade the filtering system of the kidney. This causes it to swell. The rise in white blood cells is most often a result of an allergic reaction to a medicine. But it may also be caused by some infections. Most people who have AIN recover completely. But sometimes, scarring results. If that happens, the kidney may have irreversible damage.
AIN may be caused by:
Sometimes the cause is unknown.