In my office, I often encounter patients who get sick in autumn: sneezing, runny nose, itchy eyes, coughing, and even wheezing. When I tell him that he is probably allergic to pollen, his eyes widen: Where do flowers come from in autumn? Don’t you know? Not only are there flowers in the fall, but they are mainly weed flowers with a long flowering period that lasts for 1-2 months, making fall the main season for pollen allergies. These flowers are very small, inconspicuous, no fragrance, their pollen is light, the amount of pollen is very large, can be dispersed with the wind hundreds or even thousands of kilometers, is the wind as the medium to spread pollen wind-borne flowers. Allergic people do not have to touch the flowers to be exposed to the pollen floating in the air and develop allergy symptoms. In North China, common allergic pollen comes from Artemisia, grass, quinoa, amaranth, etc. They are extremely vigorous, and the wilderness, fields, and the front of the house are all places where they live. At the end of summer, a small amount of pollen starts to drift away, gradually reaching a peak at the end of summer, and then maintaining a high concentration. That is to say, the end of August and the beginning of September each year is the time when pollen allergy symptoms are the heaviest, and in the middle and late September, after the blooming period, the symptoms gradually ease and are cured around the National Day. Of course, pollen output and dispersal are affected by climatic conditions and the timing may vary. Since allergy is a long-term chronic disease, its natural process is that more and more allergens cause the disease, more and more organs are affected, and the symptoms become more and more severe. Once you have the above-mentioned symptoms, you should not ignore them, and it is recommended to go to the Department of Allergology (allergy department) for standardized treatment.