A Challenging Diagnosis of Behçet's Disease Starting from Unexplained Fever Recurrence with Pulmonary Embolism: A Case Report

Recurrent inflammatory fevers with multisystem involvement occur clinically and may indicate an autoimmune disease. We present a young male diagnosed with pulmonary embolism who experienced recurrent fever during hospitalization and was unresponsive to antibiotics and antipyretics. A follow-up history revealed chronic oral and genital ulcers, leading to a final diagnosis of Behçet's disease. The patient's temperature normalized rapidly after corticosteroid therapy, and infection markers returned to normal. Complete remission was achieved with immunosuppression and glucocorticoid therapy. Reporting characteristics, treatment experience, and outcomes of such cases are essential to inform future diagnosis and management strategies.