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Systemic lupus erythematosus (SLE) is a chronic inflammatory disease of unknown cause, and is characterized by appearance of various autoantibodies and multiple organ involvement. Some of the systems commonly involved in SLE include the muscle and joints, brain and peripheral nervous system, lungs, heart, kidneys, skin, serous membranes, and component of blood. The clinical manifestations of SLE is protean, overlap with other illnesses, and are often subtle. However there are few documented reports on SLE associated with Crohn's disease in other countries and no reporting case in Korea. We experienced a 30-year-old female patient who was admitted for right leg swelling and diagnosed as SLE with Crohn's disease.