Sjogren's syndrome is an autoimmune disease that causes dryness in the body's moisture-producing glands due to antibodies attacking the glands. It most commonly affects the eyes and mouth, causing dryness, as well as other organs. Complications can include infections, kidney problems, or pancreatitis in rare cases. Symptoms include dry eyes and mouth, fatigue, joint pain, and lung involvement. The condition is diagnosed through tests of tear and saliva production, along with biopsies of salivary glands. Treatment focuses on replacing moisture and suppressing the immune system.