updated 9/1/2011 12:11:49 PM ET 2011-09-01T16:11:49

Tennis star Venus Williams has announced she's dropping out of the U.S. Open because of an autoimmune disorder called Sjogren's syndrome.

In autoimmune disorders, your immune system attacks your own tissues, mistaking them for harmful pathogens. Rheumatoid arthritis, Type 1 diabetes and lupus are other examples of autoimmune disorders.

In Sjogren's syndrome, the immune system's white blood cells attack glands that make tears and saliva, according to the National Institutes of Health. Damaged glands can't properly produce tears and saliva, resulting in the two main symptoms of the condition — dry mouth and eyes, according to the Sjögren’s Syndrome Foundation. As many as 4 million Americans have been diagnosed with the condition, the foundation says.

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Patients can also experience fatigue and joint pain, as Williams said she does. In a statement, Williams said the disease has also affected her energy level.
Sjogren's syndrome usually develops in people in their 40s; Williams is 31. Ninety percent of patients are women.

There is no cure for the condition. Treatments can include over-the-counter or prescription medications for dry eyes and mouth, and drinking water more frequently, according to the Mayo Clinic. Anti-inflammatory drugs can be taken to treat the pain, and drugs that suppress the immune system may also help with whole-body symptoms, the Mayo Clinic says.

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