Urticaria is generally not contagious, but some infectious diseases can cause urticaria-like symptoms and are contagious. Urticaria, commonly known as rubella, is a limited edema that occurs due to increased vascular permeability of the skin’s mucous membranes. Urticaria can be caused by a variety of reasons, such as mechanical irritation, mosquito bites, infectious factors, psychiatric factors, drug factors, allergic factors and so on. Among the infectious factors are some infectious diseases, such as viral hepatitis, which is contagious. Excluding infectious diseases, although urticaria is generally not contagious to others, it may have some impact on the patient’s life. For example, hives may cause discomfort such as itching, pain, and swelling, which affects the patient’s quality of life. Therefore, if you are suffering from hives, it is recommended that you seek medical attention in time and under the guidance of your doctor.