In general urticaria is not fatal, but acute episodes of urticaria can be associated with symptoms such as laryngeal edema and anaphylactic shock, which may lead to death if not treated in time. Common complications of urticaria attack include skin symptoms, gastrointestinal symptoms, respiratory symptoms, etc. 1. Skin symptoms: after the onset of acute urticaria, the surface of the skin may appear immediately after the red masses, the size of which varies, sometimes large single sometimes grouped, appear quickly dissipate faster, usually accompanied by severe itching symptoms, prompting patients to scratch. 2. Gastrointestinal symptoms: If the mucosa of gastrointestinal tract is involved, patients may experience gastrointestinal symptoms such as nausea, vomiting and diarrhea. 3. Respiratory symptoms: severe urticaria patients may have difficulty breathing, laryngeal edema and other symptoms, which can lead to death. Some patients may even have life-threatening symptoms such as decreased blood pressure and anaphylactic shock. If the above symptoms occur, it is recommended to go to the hospital in time, early and regular treatment, so as not to delay the condition and produce serious consequences.