Autoimmunity is actually an abnormal disease of the immune system, which is a barrier that is monitored by the immune organs and defends itself. The body’s immune system is capable of distinguishing between itself and foreign bodies and will not react to its own immunity under normal circumstances. However, in special cases, the body’s own immune system becomes abnormal and reacts to its own immunity, eliminating its own healthy and normal cells as germs and causing inflammation and disease in the body, which is an autoimmune disease. According to the degree and scope of damage caused by the autoimmune system’s reaction to organs, autoimmune diseases are divided into organ-specific and non-organ-specific, such as autoimmune anemia, rheumatic heart disease, and myasthenia gravis, and non-organ-specific, such as systemic lupus erythematosus and rheumatoid arthritis.