The common causes of urticaria include drug allergy. If urticaria is caused by drug allergy, it can be handled by general treatment and drug treatment. 1. General treatment: For urticaria caused by drug allergy, patients should first find and stop using the drug that causes the disease, and choose other drugs to replace it under the guidance of the doctor. In addition, try to avoid scratching the lesions, pay attention to skin cleaning, care, etc.. 2. Drug therapy: hives patients can take antihistamines, such as avastin, cetirizine, loratadine, etc., can play the role of anti-allergy, anti-itch. For patients with serious conditions or anaphylaxis, laryngeal edema, it is recommended to inject dexamethasone, methylprednisolone and other drugs, which can improve the condition. Drugs need to be used in accordance with medical advice. The emergence of drug-induced urticaria, it is recommended that patients go to a regular hospital, with the doctor for standardized treatment.