The two main symptoms of Sjogren's syndrome are:

• Dry eyes. Your eyes might burn, itch or feel gritty — as if there's sand in them.

• Dry mouth. Your mouth might feel like it's full of cotton, making it difficult to swallow or speak.

Some people with Sjogren's syndrome also have one or more of the following:

• Joint pain, swelling and stiffness

• Swollen salivary glands — particularly the set located behind your jaw and in front of your ears

• Skin rashes or dry skin

• Vaginal dryness

• Persistent dry cough

• Prolonged fatigue

Sjogren's syndrome is an autoimmune disorder. Your immune system mistakenly attacks your body's own cells and tissues.

Scientists aren't certain why some people develop Sjogren's syndrome. Certain genes put people at higher risk of the disorder, but it appears that a triggering mechanism — such as infection with a particular virus or strain of bacteria — is also necessary.

In Sjogren's syndrome, your immune system first targets the glands that make tears and saliva. But it can also damage other parts of your body, such as:

• Joints

• Thyroid

• Kidneys

• Liver

• Lungs

• Skin

• Nerves

Sjogren's syndrome typically occurs in people with one or more known risk factors, including:

• Age. Sjogren's syndrome is usually diagnosed in people older than 40.

• Sex. Women are much more likely to have Sjogren's syndrome.

• Rheumatic disease. It's common for people who have Sjogren's syndrome to also have a rheumatic disease — such as rheumatoid arthritis or lupus.

The most common complications of Sjogren's syndrome involve your eyes and mouth.

• Dental cavities. Because saliva helps protect the teeth from the bacteria that cause cavities, you're more prone to developing cavities if your mouth is dry.

• Yeast infections. People with Sjogren's syndrome are much more likely to develop oral thrush, a yeast infection in the mouth.

• Vision problems. Dry eyes can lead to light sensitivity, blurred vision and corneal damage.

Less common complications might affect:

• Lungs, kidneys or liver. Inflammation can cause pneumonia, bronchitis or other problems in your lungs; lead to problems with kidney function; and cause hepatitis or cirrhosis in your liver.

• Lymph nodes. A small percentage of people with Sjogren's syndrome develop cancer of the lymph nodes (lymphoma).

• Nerves. You might develop numbness, tingling and burning in your hands and feet (peripheral neuropathy).