A Case of Adult Onset Stills Disease

Adult-onset Still's disease (AOSD) is characterized by fever, rash, and joint pain and may lead to chronic arthritis. The cause of AOSD is unknown, and it is rare. We encountered a patient with adult-onset Still's disease following a sore throat and fever. The patient was a 40-year-old woman who consulted our hospital because of a sore throat, fever and arthritis. She was admitted and treated with antibiotics, but the fever persisted. Laboratory parameters of increased inflammatory activity, hyperferritinemia, a diagnosis of AOSD was made based on Yamuguchi criteria after the exclusion of other potential diagnoses. When acute pharyngitis is observed in association with significant changes in laboratory parameters despite mild local symptoms, or when pharyngitis is observed in association with joint pain, continuous fever, and a rash, it is important to consider AOSD