How is urticaria caused?

Urticaria commonly known as rubella, its pathological factors are very complex, common pathological factors are caused by allergies, some urticaria is non-immune, or not because of allergic factors induced. Its common reasons are: 1, food allergies, such as foreign protein, special fruit. 2, drug allergies. 3, mood is also a good hair factor. 4, physical factors, such as exposure to hot and cold air stimulation. 5, inhalation allergy, penicillin smell or inhalation pollen, dust and so on.