Studies have shown that smoking contributes to your risk. This includes conditions such as ankylosing spondylitis and reactive arthritis. Have a weakened immune system or an autoimmune disorder.Certain infections, such as syphilis or HIV/AIDS, are linked with a significant risk of iritis. Develop a sexually transmitted infection.People with a specific change in a gene that's essential for healthy immune system function are more likely to develop iritis. Your risk of developing iritis increases if you: Stopping these medications usually stops the iritis symptoms. Rarely, bisphosphonates, used to treat osteoporosis, can cause uveitis. Some drugs, such as the antibiotic rifabutin (Mycobutin) and the antiviral medication cidofovir, that are used to treat HIV infections can be a rare cause of iritis. This autoimmune disease involves the growth of collections of inflammatory cells in areas of your body, including your eyes. Chronic iritis can develop in children with this condition. An uncommon cause of acute iritis in Western countries, this condition is also characterized by joint problems, mouth sores and genital sores.

Diseases include a type of arthritis called ankylosing spondylitis, reactive arthritis, inflammatory bowel disease and psoriatic arthritis. People who develop certain autoimmune diseases because of a gene alteration that affects their immune systems might also develop acute iritis. For instance, they may include toxoplasmosis, an infection most often caused by a parasite in uncooked food histoplasmosis, a lung infection that occurs when you inhale spores of fungus tuberculosis, which happens when bacteria enters the lungs and syphilis, which is caused by the spread of bacteria through sexual contact. Infectious diseases from other viruses and bacteria can also be linked to uveitis. Viral infections on your face, such as cold sores and shingles caused by herpes viruses, can cause iritis. Blunt force trauma, a penetrating injury, or a burn from a chemical or fire can cause acute iritis. In some cases, iritis can be linked to eye trauma, genetic factors or certain diseases. Often, the cause of iritis can't be determined. Request an Appointment at Mayo Clinic Causes

Irregular pupil shape