A chronic autoinflammatory disease in which innate immune response is activated abnormally causing fever and inflammation-related damage to tissues and organs. The episodes can last for several days and occur weeks to months apart, manifestations include erythematous plaques on the skin, abdominal pain, dry eyes, dry mouth, mouth sores, chest pain and gland enlargement. This condition likely results from a combination of genetic and environmental factors. Variations in the NOD2 gene increase risk and it is suspected that environmental factors such as infections may also play a role in triggering the disease in people with genetic variants that increase their risk. The syndrome appears to be a complex disease without a single genetic cause.