1, pay special attention to the environment and objects around you when your symptoms are more obvious, if each attack is related to a fixed substance and environment, it may be the allergen. 2.If you have no allergic symptoms when traveling abroad but have them locally, you should pay attention to the difference between the local and foreign environments. 3.Sneezing and running water while sleeping may be related to your bedding or even the material of your bed. 4, some people may be allergic to a lot of factors, in the cold air or slightly odor stimulation can induce allergic symptoms. 5, pay attention to whether there is acid reflux or often ouch, some studies show that esophageal reflux may be related to allergic rhinitis. 6, go to the hospital for allergen test, can be including pollen, ragweed, dust mites and many other substances related to the test, in order to test out the allergen, most of the use of skin test (scratch, intradermal and contact method, etc.). 7. Allergic factors may be one or many, with many accounting for the majority.