Acute urticaria is caused by allergies in most cases, but in a few cases non-allergic factors can also cause acute urticaria. Acute urticaria is mainly caused by various allergic factors, such as food factors, infectious factors, medication factors and other factors caused by a kind of skin allergic disease. In a few cases, some people with special health conditions may also suffer from acute urticaria when they are exposed to external mechanical stimuli. In addition, emotions, stress and other factors can also cause acute urticaria. Patients with a history of allergy should pay attention to do a good job of protection, especially in life and diet, should try to avoid contact with allergens, emotions, stress and other adverse triggers, in order to reduce the probability of acute urticaria attacks. Once the symptoms of urticaria appear, it is recommended that patients should consult a doctor in time and standardize the treatment under the guidance of the doctor.