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Nivolumab is a novel chemotherapy currently approved for the treatment of multiple metastatic malignancies. This class of therapy, known as immune checkpoint inhibitors, is notable for an autoimmune-related adverse event profile. Diarrhea and colitis are common gastrointestinal adverse events, however, upper gastrointestinal events are rarely reported. We present a case of nivolumab-associated esophagitis and gastritis that has yet to be reported in the published literature.