The etiology of urticaria is very complex, in addition to various allergens related to personal sensitivity and genetics and other factors have a close relationship with common triggers: 1, food allergies: fish, shrimp, crab, eggs, meat and other animal proteins are the most common. 2, infection: bacteria, fungi, viruses can cause reactions through the antigenic effects of infectious agents or change the stress state of the body. 3, physical and chemical factors: such as cold, heat, sunlight and mechanical stimulation, friction and pressure can cause reactions or non-reactive urticaria. 4, drug allergy: atropine, aspirin and other drugs can directly stimulate the mast cells to open histamine, which is also one of the causes of urticaria. 5, endocrine and metabolic disorders and gastrointestinal dysfunction can induce this disease. 6, genetic factors such as familial stern cold urticaria, hereditary familial urticaria syndrome and genetic factors related. 7, mental factors mental tension, emotional excitement can cause acetylcholine release, enhanced vascular permeability and the occurrence of urticaria. The first thing you need to do is to get a good idea of what you are getting into. In view of its pathogenic characteristics, the prevention and care in daily life is particularly important. 1, pay attention to the warm and cold conditioning, prevent colds, strengthen physical exercise, strengthen the body resistance. 2, prohibit or prohibit certain drugs or foods that cause allergies, avoid contact with allergenic items, and actively prevent and control certain intestinal parasitic diseases. 3, during the onset of urticaria avoid eating seafood and spicy hair. 4.Remove chronic lesions and intestinal parasites from the body and regulate endocrine disorders.