Spring is here and the flowers are in full bloom. It is a great time for children to be outdoors and go trekking. However, spring is also a good season for allergic diseases. There is a significant increase in common allergic diseases, such as eczema, urticaria, papular urticaria, hay fever (allergic rhinitis and allergic conjunctivitis), and asthma. A variety of symptoms appear, such as skin erythema, papules, wind clumps, itching, runny nose, incessant sneezing, itchy nose, cough and shortness of breath. Parents may ask why there is an increase in allergic diseases in the spring. This is exactly what I want to tell you now. Spring is the season when all kinds of flowers bloom and pollen from various flowers forms a floating substance in the air, which can cause allergic rhinitis, conjunctivitis and asthma symptoms when inhaled by allergy-prone children. Pollen scattered on the skin may cause skin allergies. Also spring is the season when everything comes back to life and dust mites and insects start to increase and become active. Dust mites are the most common allergens in China. The temperature and humidity in spring are very suitable for the growth and reproduction of dust mites, and dust mite allergy can cause various allergic diseases; insect allergy can cause papular urticaria. Moreover, due to the unstable temperature in spring, children are prone to catch cold, human resistance decreases, viruses, bacteria, mycoplasma and other pathogens can easily cause infections and aggravate allergy symptoms. First, let’s review the knowledge about allergies. What are allergies and allergens? Allergy is an overreaction of the body’s immune system to contact, inhalation or ingestion of a harmless substance from the air, water, contact or food. Allergens, on the other hand, are antigens that trigger allergic reactions and can enter the body by any means, including inhalation, ingestion, injection or contact, causing the body to become allergic. There is a wide variety of allergens, and it can be said that any substance other than sugar and salt, including food, inhalants floating in the air, drugs, chemicals, viruses or bacteria, etc. can be allergens. Allergic diseases are diseases caused by the body’s overwhelming immune response to one or more allergens in the environment, which leads to damage to tissues and organs. In medicine, allergic diseases are also called allergic diseases, or “allergies” as they are often called. The common symptoms are: 1. Symptoms appear in each attack, and after the disease is controlled, the same symptoms appear again in the next attack as in normal people. For example, when allergic rhinitis attacks, there is a runny nose, continuous sneezing, nasal itching, but no symptoms when there is no attack. 2.Recurring. The same symptoms occur repeatedly. Such as allergic rhinitis children repeatedly have a runny nose, sneezing and nasal itching. 3.Intermittent. Two episodes of symptoms are often separated by a period of time, and there are no symptoms in the interval, just like normal people. 4.There are certain triggers. Suspected triggering factors can be identified for each symptom attack. For example, allergic rhinitis children develop after exposure to pollen or dust mites. Mom and dad understand this knowledge, when the baby has symptoms, you can initially determine whether it is an allergy or a bacterial or viral infection. When talking about allergies in spring, pollen allergy is essential. But what is pollen allergy? What is the difference with allergic rhinitis? Perhaps parents are not clear. Hay fever is also known as seasonal allergic rhinoconjunctivitis, formerly known as chytridiomycosis. Hay fever refers to a series of clinical symptoms mainly allergic rhinitis, conjunctivitis, asthma and skin allergy caused by the exposure and inhalation of pollen by people with allergies. Hay fever has obvious seasonality and regionality and is easily affected by certain meteorological factors, with symptoms coming and going with the flowers. Allergic rhinitis, on the other hand, has only simple rhinitis symptoms, and the cause of allergy is not limited to pollen, but other allergens can also cause it.