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One hundred cases of urticaria were studied to find out the etiology and to detect any co-relation between etiology and clinical manifestation. In 59% cases an etiological factor could be detected and the diagnosis was more certain in acute cases. In more than two-third of cases of chronic utricaria, the etiology could not be detected. Type and distribution of the lesions did not suggest any particular etiology except in the cases of physical and cholinergic urticaria.