Tubulointerstitial nephritis is an inflammatory condition affecting the renal tubules and interstitial tissue, leading to impaired kidney function. It is clinically significant as it can result in acute kidney injury and chronic kidney disease if not promptly diagnosed and treated. A key association is with drug-induced nephrotoxicity, particularly from non-steroidal anti-inflammatory drugs (NSAIDs) or antibiotics, highlighting the need for careful medication management in at-risk patients.