Autoimmune diseases occur when the body’s immune system mistakenly attacks its own healthy tissues and cells. Under normal circumstances, the immune system is responsible for identifying and fighting off foreign pathogens, such as bacteria and viruses. However, in autoimmune diseases, the immune system misidentifies normal tissues as "enemies," producing autoantibodies that attack healthy cells. The exact causes of autoimmune diseases are not fully understood, but factors such as genetics, environmental triggers, infections, and hormonal changes may play a role. Common autoimmune diseases include rheumatoid arthritis, multiple sclerosis, systemic lupus erythematosus, Crohn's disease, and thyroid disorders. Symptoms are varied and may include fatigue, joint pain, inflammation, skin issues, and digestive discomfort. Since these diseases are typically chronic and incurable, treatments focus on managing symptoms and slowing disease progression. Main treatments include immunosuppressive drugs, anti-inflammatory medications, hormone therapies, and lifestyle changes to help patients alleviate discomfort and improve quality of life.