Autoimmune diseases are a result of the immune system attacking the body’s cells and tissues. There are more than 80 identified autoimmune diseases and they are divided into two categories. Tissue or organ-specific autoimmune diseases such as Celiac and Crohn’s disease target only one organ or group of tissues. Systemic diseases such as lupus cause damage throughout the body. Lupus occurs when the immune system develops antibodies that attack tissues in the lungs, joints, kidneys, nerves, and blood cells. These diseases may happen in all ages. To know about the common child autoimmune diseases view this site.