Why is uveitis often difficult to trace to a specific cause?

Uveitis is frequently classified as idiopathic, meaning that in a large proportion of cases, it is impossible to determine a specific underlying cause. This is particularly common when the inflammation is confined to the anterior segment of the eye.12

While the condition can be triggered by various factors—including infections (viral, bacterial, fungal, or parasitic), systemic autoimmune diseases, or physical trauma—the diagnostic process often fails to pinpoint a definitive origin. Because the clinical presentation of uveitis can overlap with other conditions, doctors must often perform laboratory tests to rule out malignant mimics, such as intraocular lymphoma or leukemia, rather than identifying a single causative agent.12

Even when a specific cause remains elusive, clinicians typically manage the condition using corticosteroids to control inflammation and prevent permanent vision loss.12