Hay fever, also known as hay fever, is caused by patients' allergy to plant pollen, which is mainly characterized by itchy nose, continuous sneezing, a large amount of clear water-like runny nose and nasal obstruction; May be accompanied by itchy eyes, tears, conjunctival congestion, cough, asthma, chest tightness, breath holding, etc. It can also cause itchy skin and rash. If these symptoms appear, you need to go to the allergy department or allergy clinic of the hospital in time to check allergens and carry out symptomatic treatment in time. The onset time of pollen allergy has obvious seasonality, and trees (elm, poplar, willow, cypress, birch, ash, Toona sinensis, oak, mulberry and walnut) are the main ones in spring, and most of them occur in March-June. In summer, allergic pollen mainly comes from grasses and grasses (corn, sorghum, wheat, sedge, Chenopodiaceae, Amaranthaceae, Compositae, Leguminosae), and most of them occur from May to August. Weeds or weeds (Artemisia pollen, Humulus pollen, Kochia scoparia, Sunflower, Hemp, Ricinus communis) are the most allergic in autumn, and they occur in July 7- 10/0. They can overlap each other, and they are all wind-pollinated flowers.

Preventive measures are as follows:

1, avoid pollen contact in different places, such as autumn pollinosis patients in the north living in the south for 2 months.

2. Try to minimize going out in the season with more pollen, especially in mountainous areas or grasslands with dry and windy weather and many flowers and plants.

3. If you go out, wear long-sleeved clothes, a pollen mask (which can be purchased on a regular website), pollen glasses or a white transparent scarf on your head. For field work or spring outing, it is best to bring some antiallergic drugs, such as kaisiting, kairuitan, chlorpheniramine and diphenhydramine.

4. After going home, clean the face, nose, eyes and other parts with pollen, change the coat to reduce pollen contact, and bathe before going to bed to remove pollen from other parts of the body.

5. In the pollen season, close doors and windows, open air conditioners with filtering function, install pollen-proof window screens, and do not hang clothes outdoors.

6, the application of pollen blockers to protect the nasal mucosa from pollen (such as kemin, etc.).

7, keep the room air moist, application of air purifier or air conditioning filtration.

8. Adhere to a healthy lifestyle and maintain an optimistic and cheerful mood.

9. Selective desensitization treatment after the pollen season can alleviate the symptoms of hay fever in the coming year.