what does an overactive immune system mean
10 hilariously insightful foreign words. An overactive immune system, or autoimmune disorder, is when the immune system attacks and destroys healthy body tissue rather than the antigens it is supposed to target. Tissue damage, organ damage and changes in organ function are some of the results of autoimmune diseases. diagram showing different types of white blood cells, an important part of the immune system. Reishi mushrooms are one type of alternative treatment for an overactive immune system. Rheumatoid arthritis is one commonly known result of an overactive immune system.