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Urticaria itself is not contagious. Normally, infection is the transmission of a disease from one person to another by some route. Therefore, three conditions must be met for infection: the source of infection, the route of transmission and the susceptible population. However, in clinical urticaria induction factors are mainly related to allergies, such as eating some allergic food or inhaling gas, contact with certain substances and other allergic symptoms, so urticaria is not an infectious disease, so it will not be infectious. However, the causes of urticaria are very complex, need to see a hospital after examination allergy original clear incentives.