Urticaria is caused by how

Some people say that urticaria is caused by wind, some said that the swelling on the skin urticaria is food, is easy to eat the food cause allergy-induced. In fact, urticaria caused by many reasons, but also very complicated, most people can not find a clear reason.

Urticaria induced by common factors are as follows:
1, food. Regardless of animal foods such as fish, shrimp, crab, eggs, beef and mutton, dairy products and so on, or plant food, such as pineapple, mushrooms, broad beans, garlic, strawberries, tomatoes, etc. can cause urticaria, but animal Urticaria induced by food and dairy products for more. Food additives, such as children often favorite cold drinks, soft drinks, ice cream, cakes, chocolate and other foods containing food additives because of their extensive, chronic urticaria is often the incentive can not be ignored.
2, drugs. About 14% of drug-induced dermatitis manifested as urticaria, showing the drug is an important factor leading to urticaria. Common penicillin drugs and the penicillins, followed by sulfa drugs, tetracyclines, Furazolidone, aspirin and other anti-fever drugs, sedative hypnotics, whether oral or intravenous or intramuscular injection, can induce urticaria.
3, infection. A variety of infections, particularly infections in children suffering from urticaria often combined, such as purulent tonsillitis, otitis media, pyoderma, toothache, alveolar abscess, the flu, pharyngitis, hepatitis, parasitic diseases, gastroenteritis, etc. is a common predisposing factor.
4, physical and chemical factors. Such as cold, heat, sun, squeezing, friction, scratch and are often caused by moisture, such as urticaria.
5, inhalation or contact with objects. Such as pollen, airborne mold spores, animal dander and feathers, grave-sweepers, chemical fiber fabrics, such as wear.
6, blood transfusion and blood products. Various antitoxic serum, globulin, albumin and so on.
7, the spirit of factors. If excessive tension, insomnia and so on.
8, genetic factors. Such as familial urticaria syndrome, familial limitations of heat urticaria, hereditary angioedema, such as.