Systemic Lupus Erythematosus Mimicking a Possible Eating Disorder.

Systemic lupus erythematosus (SLE) is an autoimmune disease that presents with a wide range of symptoms due to its ability to affect multiple organ systems. We present a case report of a 17-year-old female with a chief complaint of a four-month history of weight loss and generalized weakness, along with a two-month history of intermittent hematochezia. Features of the patient's initial presentation made the treatment team suspicious of anorexia nervosa. However, further workup led the team to a diagnosis of SLE. This case exemplifies a rare presentation of lupus that initially mimicked an eating disorder and did not develop classic lupus findings until months after the disease process began.