This document presents information about autoimmune diseases from MD. Zahirul Islam. It defines autoimmune disease as a condition where the body produces antibodies that attack its own tissues, leading to damage. It provides examples of common autoimmune diseases like lupus, rheumatoid arthritis, and diabetes. The document notes there are two main types - systemic disorders involving non-specific autoantibodies and local disorders targeting specific tissues. It discusses the most common organs and tissues affected by autoimmune diseases and describes methods of diagnosis and treatment options for some conditions.