Urticaria is a reaction of local tissue edema caused by increased vascular permeability under the skin’s mucous membranes, which manifests as erythematous clusters. The causes of urticaria are multiple and are not only related to low immunity. The main common causes: first, infection, including bacterial infection, viral infection, fungal infection, etc. Second, food allergies, eating seafood or other types of food with high protein, mainly containing additives more food. Third, contact with something allergic. Fourth, physical factors, sun exposure, stress and other reasons. Fifth, mental factors, emotional stress, depression, anxiety, may also lead to the occurrence of hives. In addition, there are autoimmune diseases, such as lupus erythematosus, thyroid hormone, hyperthyroidism. There are chronic diseases, such as diabetes, can cause the occurrence of urticaria, specific to actively look for the cause, but of course there are a large proportion of those who can not find the cause and belong to idiopathic urticaria. We actively anti-allergic at the same time to improve their own immunity, but also help the recovery of the disease. The above content is for reference only, the specific medication and treatment should be based on the guidance of the doctor’s interview.