RESUMO
Chronic idiopathic urticaria (CIU), also known as chronic spontaneous urticaria, is characterized by the presence of hives on most days of the week, for 6 weeks or longer, and without an identifiable or consistent cause. Evaluation is clinical and based on the presence of episodic urticarial lesions. Although patients are subject to overtesting during the diagnosis of CIU, guidelines suggest starting with three basic laboratory tests. Treatment is a stepwise approach, involving second-generation antihistamines, histamine2 antagonists, leukotriene receptor antagonists, first-generation antihistamines, and potent antihistamines. Refractory CIU requires adding alternative agents such as omalizumab, anti-inflammatory agents, and immunosuppressants.