Urticaria etiology and clinical types

The disease is a common allergic dermatitis. Clinical manifestations of the limitations of size rubella block damage occurred suddenly and rapidly dissipated, severe itching, the more we do not leave any traces of the disease of addiction Chinese equivalent of measles. [Causes] Urticaria caused a number of factors, notably: 1. Inhalation of such as pollen, animal dander, smoke, fungal spores and certain volatile substances. 2. Food such as fish, shrimp, eggs, milk and other proteins or other rich food. 3. Drugs such as vaccines, heterologous serum, blood transfusion, penicillin, furazolidone, such as aspirin. 4. Infected with parasites, bacteria (such as tonsillitis, nose beside sinusitis, chronic appendicitis, etc.), viruses (such as hepatitis, Gesaai (Coxsackie) virus infection), fungi (eg dermatomycoses). 5. Physical factors such as sunlight, cold, hot and humid, etc.. 6. Factors found in the spirit of the spirit of tension or excitement, and after exercise. 7. Scared as some other insect bite thorn sting, the flora and fauna such as exposure to a nettle, and drugs vine, as well as suffering from some skin or systemic diseases, such as mast cells increased disease, rheumatic fever, leukemia and certain endocrine diseases. Pathogenesis currently not fully understood. Acute urticaria is generally believed that most of the first type Ⅰ allergic. Because mast cells caused by the release of histamine, which telangiectasia, increased permeability of Health, a large number of plasma proteins into the dermis, the clinical performance of the corporation or limitations for wind edema. Some of urticaria, allergic type Ⅲ. Ⅲ allergic to antigen-antibody complex reaction, antigen-antibody complex complement activation in a process of allergic toxins, stimulate mast cells to release histamine, resulting in urticaria. Apart from the above allergy, some stimulating factor, as some drugs, food, physical factors, chemical substances, enzymes and tissue damage, and so on, can direct role in the mast cells to release histamine and cause urticaria. In addition, certain urticaria with congenital genetic quality (AD). [Types of] There are unusual urticaria, vascular edema, artificial urticaria, solar urticaria, cold urticaria, cholinergic urticaria, and other types.