Sjogren's syndrome is an autoimmune disease characterized by dry mouth and dry eyes due to lymphocytic infiltration and destruction of the salivary and lacrimal glands. It was first described in 1933 by Swedish ophthalmologist Henrik Sjogren. The disease causes immune-mediated inflammation of the salivary, lacrimal, and sweat glands. Diagnosis involves evaluating symptoms, signs of dryness, blood tests for autoantibodies, and biopsy of the salivary glands showing lymphocytic infiltration. Treatment focuses on relieving dryness symptoms with artificial tears and saliva, as well as immunosuppressants in severe cases.