If a patient has had urticaria before, and after a long time, a sudden attack of urticaria occurs, this situation does not require special concern. If antihistamines are not very effective, you can go to the hospital and apply calcium gluconate and glucocorticoid drip for further treatment. You can also apply finasteride intramuscularly to control your own allergic inflammatory reaction. However, if the patient has recurrent urticaria within a short period of time, and the duration of the disease is more than a few weeks, the patient should adhere to the regular oral antihistamines, but also with oral and external Chinese medicine treatment, and can also go to the hospital to investigate the allergens.