Aug 24, 2024 · Allergies happen when the immune system reacts to a foreign substance that gets inside the body. These substances are known as allergens. They include pollen, bee venom and pet dander. Allergies also can happen due to certain foods and medicines that don't cause reactions in most people.

Nov 20, 2023 · Allergies are when your immune system overreacts to something called an allergen. An allergen is a foreign substance that's not harmful to most people, such as pollen or pet dander (skin...

Apr 1, 2025 · Allergies happen when your immune system overreacts to something that’s usually not harmful — like pollen, pet dander and certain foods. Symptoms can include everything from sneezing and a runny nose to vomiting and difficulty breathing. If you can’t avoid allergens, there are some medications that might help reduce your symptoms.

Allergies, also known as allergic diseases, are various conditions caused by hypersensitivity of the immune system to typically harmless substances in the environment. [11] These diseases include hay fever, food allergies, atopic dermatitis, allergic asthma, and anaphylaxis. [1]

Apr 12, 2024 · An allergy is the result of your immune system overreacting to a trigger. Common allergies include pollen, insect venom, latex, pet dander, peanuts, and mold.

Jul 31, 2023 · Allergy is a broad topic and speaks to the body’s immune response to foreign substances common in the environment, and triggers a reaction from the body’s immune response described as hypersensitivity.

Jul 19, 2024 · An allergy is an immune system response to a foreign substance that’s not typically harmful to your body. Learn more about the types, causes, and symptoms of allergies, and how they're treated.

Hay fever (allergic rhinitis), eczema, hives, asthma, and food allergy are some types of allergic diseases. Allergy symptoms can range from mild to a serious, life-threatening allergic reaction (anaphylaxis). Allergic reactions begin in your immune system.

Nov 20, 2023 · Read about allergy treatment, symptoms, testing, shots, and medicine. Learn about the types of allergies (asthma, allergic rhinitis, seasonal, conjunctivitis, eczema, anaphylaxis, hives) causes, risk factors, and more.

There are many different types of allergies. Some people are allergic to dust, pet dander, pollen or mold. Others are allergic to latex, or certain drugs or insect stings. Food allergies are also common. Any food can cause an allergic reaction, but the eight most common food allergens are eggs, milk, peanuts, tree nuts, fish, shellfish, wheat, soy.