Most people with uveitis are in fact otherwise healthy and do not have inflammation elsewhere in their body.
Uveitis can be caused by infection (germs) in the eye.
In some cases, uveitis is related to bodily autoimmune diseases, which the patient may or may not be aware of. We can test for these diseases if we suspect them. Sarcoidosis is probably the most common such illness causing uveitis.
Some people carry a gene, called HLA B27, that predisposes a person to having autoimmune diseases. These diseases include ankylosing spondylitis, psoriatic arthritis and some forms of ulcerative colitis and Crohn’s disease and uveitis commonly occurs in individuals with these problems.