Allergy is a word that is both common and specialized. It is common because even non-medical professionals know the meaning of allergy, but it is specialized because few people can really understand the causes and consequences of allergy, and there are various diseases caused by allergy, such as hives, eczema, rhinitis, asthma, conjunctivitis, enteritis, etc. Allergies are so common that if they are not effectively prevented and treated, they can pose a health risk to the public. So, let’s start with understanding allergens. Allergens, literally speaking, are the cause of allergies. Previously, allergens were also written as allergens, which means the source, but now they are uniformly called allergens in medicine. If the cause of the allergy can be found, the disease is half, or even half, treated. For example, if a person’s allergen is milk, if he avoids contact with milk, the disease caused by his allergy will be cured by itself. But there are so many different things in the world, and there are so many different causes of allergies. There is one type of allergen that both doctors and sufferers take seriously, and that is medication. Drug allergies can range from a small rash and itching to coma and shock, which can be life-threatening. However, the most common allergens are not drugs, but common things we come in contact with everyday, such as food, pollen, detergents, dust mites, heavy metals, animal fur, molds, etc. At present, the most types of allergens detected in China are 35 categories of allergens, more than 1000, roughly divided into food, inhalants, daily exposure, environmental compounds, drugs and so on. Food allergens are believed to be no stranger to us. For example, many people will have red lips after eating mangoes, or even face or even whole body redness, and in serious cases, suffocation and difficulty in breathing, these people are allergic to certain ingredients in mangoes. In common recipes, most people are aware of their allergens. For example, when dining at a party, you often hear people say, “I can’t drink alcohol, I’m allergic when I drink it; or I can’t eat shrimp, my whole body itches when I eat it. Yet there are some foods that we ingest every day and do not pay enough attention to. Such as wheat, rice, yeast, wheat gluten, eggs, etc. Wheat is most commonly found in pasta, such as steamed buns, noodles, etc. Yeast is found in fermented foods, such as bread, cookies, cakes, steamed buns, etc. Wheat gluten is found in foods with high gluten content, such as bread, cakes, instant noodles, doughnuts, etc. If someone is allergic to all five of these substances, what else can that person normally have as food? It is disturbing that such allergies to common recipes are already common. One category of food allergens that is much more common, but draws little attention, is food additives. We are all familiar with additives such as preservatives, sweeteners, and colors, which are widely found in all types of foods and beverages. Other additives such as monosodium glutamate (the main component of MSG), spices, gum Arabic, etc., are also very common. In today’s increasingly serious food safety problems, allergic diseases caused by this type of allergens have become very common. Just ask who has not eaten snacks, jelly, ham sausage, ice cream, and who has not drunk drinks? Inhalants as allergens are easily understood by everyone, such as pollen and dust mites. Every spring, there is a surge in allergic diseases, which is closely related to this. Inhalants are environmental allergens that are mostly difficult to avoid. While food can be avoided, a person cannot help but breathe, and as long as one breathes, there will be inhalants. Therefore, these patients often feel very painful and helpless. Sometimes people often refer to “wind” as the culprit for the onset of the disease, in many cases, it is due to inhalation allergens. One category of inhalants is often overlooked, and that is mold. Mold is widespread in nature, especially in the dark, damp, moldy environment, the harm caused by mold is particularly serious. There are some industrial compounds as inhalation allergens, the pathogenic effect is even greater, such as formaldehyde, benzene, car exhaust, environmental smoke, etc.. Therefore, protecting the environment can not only improve air quality, but also reduce the number of patients by reducing inhaled dust mites, industrial compounds, and emissions. The process by which everyday contacts become allergens is often very slow, even to the point of accumulation, and is therefore often overlooked. For example, detergents, preservatives, nickel alloys, amalgams, wood fibers, pigments and dyes, and even water can be used as contact allergens to cause disease. In recent years, one allergen that has been increasingly taken seriously by doctors is pesticides. Insecticides can be used as pesticides and are also used in mosquito repellent and insect repellent products. And an increasing number of patients are being tested for insecticide allergies, which is related to the increasing abuse of pesticides. How many of the vegetables and fruits on our tables today were not grown under the action of large amounts of pesticides? How many of the so-called green products and organic products do not have pesticide residues? With the development of the times and changes in the environment, the variety of allergens is becoming more and more difficult to deal with. How to find allergens as accurately as possible and treat them in time requires the joint efforts of doctors and patients to accomplish. If you suspect that you are suffering from an allergic disease, you should also go to a regular professional hospital for testing and treatment to avoid delays.