Purpose : Chronic urticaria is a disorder characterized by the appearance of wheals for more than 6 weeks; in most cases, the etiology is unknown. This study was aimed to discover the clinical aspects, the etiologic factors, and the course of chronic urticaria.
Methods : 5 1 children who were diagnosed with chronic urticaria in the past 4 years, and who had had follow-ups more than 6 months after diagnosis in the pediatric department of Soonchunhyang University Hospital in Bucheon, were enrolled in the study. The laboratory findings, clinical aspects, and courses were retrospectively investigated by medical record review and telephone interview.
Results : The median age of children with chronic urticaria was 4 years (8 months to 1 6 years) and the ratio of male to female was 1 .4 :1 . Of the total, 3 9 .2% of patients had a history of atopy. Angioedema occurred concurrently with urticaria in 1 1 .8% of patients, and dermographism was seen in 4 1 .2%. Results of thyroid function tests were normal and thyroid autoantibodies were absent in all cases. Regarding etiology, most cases (7 4 .5%) were forms of idiopathic urticaria. Urticaria was induced by physical factors in 1 9 .6% of patients. Open challenge tests revealed that 3 patients were allergic to food additives (glutamate 2 , glutamate, and sulfite 1 ). In this study, most of the patients reported good response after medication of 1 st- or 2 nd-generation antihistamines alone. Follow-up at 6 months revealed that 7 0 .6% of patients had experienced remission, and 8 4 .8% of children who had follow-up at 1 year presented remission.
Conclusion : Chronic urticaria in most patients was idiopathic. Remission occurred within 1 year of diagnosis, in most cases so chronic urticaria in children seems to have good prognosis.
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