Meaning : JRA is a disease of the immune system found in children of the age of 16 years & under. In this autoimmune disease , the immune system which supposed to protect the body from invaders , viruses etc. , instead release chemicals that can damage healthy tissues & causes the destruction of healthy joints. Symptoms of JRA : This in turn may lead to swelling , inflammation , immobility of joints , soreness , immobility of connective tissues & joint linings . A typical sign of juvenile arthritis is swelling of the joint with pain & stiffness. Some children may also develop limping or a sore wrist , finger , knee etc . Some children complain about fever in day & rashes appear & disappear on the body. some children complain about morning stiffness in joints. Causes of JRA : Causes of JRA is still unknown. It can be caused by a viral illness & in certain cases a child may be predisposed to JRA due to genetic factors . It typically affects 1 chi...