A poorly understood disease shows up in the lungs almost every time

Health · Published 2 October 2026 Swipe more like this →

In short: A clinical review of sarcoidosis, a disease of unknown cause that triggers clusters of inflammatory cells called granulomas, found that it can affect almost any organ but overwhelmingly involves the lungs: about 90% of patients show lymph node swelling in the chest and/or lung nodules, while skin, eye, liver, spleen, lymph node and joint involvement occur in 25-50% of cases.

Because sarcoidosis has no known cause and can mimic other diseases, diagnosis rests on three things together: a matching clinical or imaging picture, tissue evidence of a specific inflammation pattern, and ruling out other explanations. A few distinctive patterns, like Löfgren's or Heerfordt's syndrome, are considered reliable enough to diagnose without a biopsy.

This is a clinical overview, not new experimental data, and the authors note that despite recently updated guidelines, there is still no single standardized diagnostic test.

Why it matters: Sarcoidosis can affect almost any organ, which is why diagnosing it still relies on combining several clues rather than one test.

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