Which is more serious, acute hives or chronic hives, depends on the specific case. Acute urticaria may be a stage of chronic urticaria, and chronic urticaria has a greater impact in terms of the impact on the patient’s life. 1. Acute and chronic urticaria are basically the same in appearance. Acute urticaria comes and goes quickly, and can flare up suddenly, but also disappears and heals on its own suddenly. If hives recur for more than 6 weeks, they become chronic hives and may last for years without improvement. 2. Acute urticaria is usually caused by allergies to foreign substances. As long as the allergens are found and avoided, the disease will be cured in a few days. Chronic urticaria is basically not caused by allergy, the specific cause is unknown, but it is presumed to be related to autoimmune disorders, with a tendency to recur. 3. Acute urticaria is usually cured within 1 to 2 days and does not affect long-term life. Chronic urticaria, on the other hand, lasts for a longer period of time and has a greater impact on the patient’s life. If the patient’s urticaria symptoms are serious, or the symptoms continue and have not improved, should go to the hospital in time for treatment.