Urticaria is not contagious, hives is a common allergic skin disease, not contagious, common causes include dietary aspects, such as beef and mutton, fish and shrimp, drugs, cold stimulation, etc.. The main performance in the initial itching, followed by the appearance of erythematous clusters, the size of the clusters vary, can be fused with each other into a piece of the general body, the serious condition can appear gastrointestinal symptoms, such as abdominal pain, nausea, vomiting, etc., can also appear chest tightness, breathing difficulties, treatment to find the possible causes. In terms of drug treatment with severe respiratory distress and gastrointestinal symptoms, intravenous glucocorticoids, gastric mucosal protective agents, blood volume supplementation, etc. For less severe cases, oral drugs and topical drugs are the mainstay. Oral medication can be chosen from levocetirizine hydrochloride, keratan, and epalmatine tablets, etc. Topical medication can be chosen from glyburide lotion.