Uveitis can have many causes such as autoimmune disorders, infections or injury. However in most cases, it is often unknown.
Uveitis occurs when the body's immune system gets confused. Normally, the immune system helps protect the body by fighting off harmful invaders, but sometimes it mistakenly attacks healthy tissue instead. In the case of uveitis, this malfunction causes the immune system to attack the uvea. Sometimes, autoimmune or systemic conditions in the body can trigger uveitis.
Infections caused by bacteria, viruses, fungi, or parasites can lead to uveitis.
Rarely, an underlying injury or growth in your eye can cause uveitis.
Last reviewed: 21 July 2025