Urticaria is a temporary restrictive edema due to dilation and increased permeability of small blood vessels in the skin mucosa. It manifests as pruritic erythematous and windy patches, and some severe patients may have systemic manifestations such as abdominal pain, vomiting, chest tightness, and respiratory distress. The etiology of the disease is complex and most patients have difficulty in finding a very precise cause. Possible causes are: 1, biological: food (fish, shrimp, eggs, etc.) inhalation (pollen, dust, mold spores, etc.) infection (bacteria, viruses, parasites, etc.) 2, chemical: chemicals, etc. 3, physical: temperature, light, etc. 4, drug: antibiotics, antipyretic and analgesic drugs, etc. 5, endogenous: mental factors, genetic factors, etc. The principle of urticaria treatment to remove the cause, stop Itching, elimination of lesions and associated symptoms. Antihistamine, anti-inflammatory, capillary permeability reduction and symptomatic treatment are the main drugs, combined with local topical medication when necessary.