Why do so many people have autoimmune diseases?

Question My practitioner diagnosed me with Hashimoto’s and celiac disease, two autoimmune diseases. It seems many of my friends have an autoimmune disease too, including eczema, arthritis, Type I diabetes, and even multiple sclerosis. Why is it so common now? Answer Incidences of autoimmune disease, in which the body’s immune system attacks its own tissue, [...]