Urticaria, commonly known as “rubella”, is a limited edematous reaction due to the dilation and increased permeability of small blood vessels in the skin and mucous membranes, and usually resolves within 2 to 24 hours, but new rashes occur repeatedly and last for several days. Fifteen to 20 percent of people will have at least one episode of urticaria in their lifetime. The cause of urticaria is complex and cannot be found in about 3/4 of patients, especially in chronic urticaria. Factors such as food, inhalants, infections, medications, physical factors, insect bites and psychological factors can all contribute to its occurrence. The disease often begins with itching of the skin, followed by the appearance of wind clusters that are bright red or pale, skin-colored, or in rare cases, only edematous erythema. The lesions spread gradually and may fuse with each other to form patches. They last from a few minutes to several hours and do not leave a trace when they subside. The first step is to find out the cause of urticaria and remove it as much as possible. For example, be careful to prevent inhalation of pollen, animal dander, feathers, dust, castor powder, avoid contact with allergens, prohibit or prohibit the consumption of certain drugs or foods to which the body is allergic, etc. For travelers, the best way to prevent hives is to wear a mask when traveling, which can filter the bad disease-causing dust in the air and make the incidence of hives much lower. Especially in the wilderness or rural areas where there is more pollen and animal feathers, it is important to pay enough attention. In addition, you can go to a regular hospital to perform allergen testing to identify allergic substances. For acute patients, apply adrenaline, corticosteroids and other rescue. In general, antihistamines can be used systematically. Eat a light diet and avoid stimulating and allergenic foods. Patients should try to avoid scratching, which may cause increased lesions and increased itching. Avoid applying heat, although heat can temporarily gain relief, it can lead to the release of more allergic substances. In addition, primary diseases, such as acute tonsillitis, cholecystitis, intestinal ascariasis and other infectious diseases, should be actively treated to eliminate pathogens and prevent the occurrence of disease.