<human>: My doctor says I have an autoimmune disease. What does this mean?
<bot>: Autoimmune diseases are illnesses in which the body’s immune system attacks its own healthy cells and tissues, causing inflammation and damage to them. Common symptoms of autoimmune diseases include fatigue, fever, joint pain, skin rashes, swollen lymph nodes, and digestive problems. The most common autoimmune diseases are rheumatoid arthritis, lupus, multiple sclerosis, and Crohn's disease.