Autoimmune Interstitial Nephritis

Autoimmune interstitial nephritis affects the interstitium, the tissue between the kidney's filtering tubules, where inflammatory immune cells gather and can reduce kidney function over time. Current understanding describes an immune reaction directed against the kidney's tubular tissue, and in some people this occurs together with inflammation in the eye, a pairing known as TINU syndrome (tubulointerstitial nephritis and uveitis). It can also appear alongside other autoimmune conditions such as lupus or Sjogren's.

TINU syndrome itself is considered rare and research describes it as accounting for a small share of all uveitis cases, roughly two percent, and solid population-wide prevalence figures for autoimmune interstitial nephritis as a whole are limited, since much of what is known comes from case series rather than large population studies. Corticosteroids are the usual first treatment, with other immune-modulating medications reserved for cases that do not respond.

Common signs

Reduced urine output, and sometimes fever, rash, and joint pain, though these classic signs are often absent. Tiredness and nausea can occur as kidney function drops.

This is a plain-language summary for orientation, not a diagnosis. Mechanisms are described as current understanding, not settled fact. Work with your own clinician for your care.