How did acute urticaria cause it?

A common skin disease in acute urticaria has a great influence on patients' life and work. So, how did acute urticaria cause it? Common reasons are as follows: 1. Infection factors: including viruses (such as influenza virus and hepatitis virus), bacteria (such as golden grapes), fungi and parasites (such as roundworms). 2, animal and plant factors: such as insects biting or inhaling pollen, feathers, dander, etc. 3, physical factors: such as cold and heat, sunlight, friction, pressure can be caused. In addition, gastrointestinal diseases, metabolic disorders, endocrine disorders and mental factors can also be caused. Fish, shrimp, crab and eggs are the most common foods. Secondly, some spices and condiments can also cause. Besides, is acute urticaria contagious? This is a problem that many people care about, and it is also the most worrying problem for urticaria patients. Because I am afraid that the symptoms of urticaria will be transmitted to my family or friends, I will deliberately avoid it and lead to the breakdown of the relationship. In fact, acute urticaria is a localized edema reaction caused by various reasons, such as the expansion of small blood vessels in the skin and mucosa and the increase of permeability. The clinical manifestations of skin are redness, swelling and itching. As this disease is not contagious, it is not contagious in acute urticaria.