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Malignant hyperthermia (MH) is a rare but potentially fatal complication of exposure to certain anesthetic drugs. However, stress-induced MH, initially observed in pigs undergoing intense physical or emotional strain, has been reported in the absence of anesthetic exposure. In this case report, we describe a case of postoperative hyperthermia and cardiac dysfunction suspicious for stress-induced MH occurring after an endobronchial biopsy in a patient with recurrent undiagnosed fevers. We also examine our diagnosis of stress-induced MH and possible preventive measures to avoid this complication.