As mentioned earlier, various factors such as allergic rhinitis or the like are also known as allergen or allergic, and common allergens include:
(1) Inhalation allergens: such as indoor, outer dust, dust mites, fungi, animal fur, feathers, cotton, etc., more causes all year round; the plant pollen causes more seasonal episodes.
(2) Food allergens: such as fish shrimp, eggs, milk, flour, peanuts, soybeans, etc. In particular, certain medicines, such as sulfonamides, quinine, antibiotics, etc.
(3) Contact, such as cosmetics, gasoline, paint, alcohol, etc.
Others may be some bacteria and their toxins, physical factors such as cold and thermal changes, temperature is not adjusted), endocrine disorders or body-liquid acid base balance or other causes can be inferior. It is also possible to exist at the same time or in a variety of factors.