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.

Allergies occur when your immune system mistakenly triggers an allergic reaction to an allergen. Allergic reaction symptoms include congestion, watery eyes, a runny nose, vomiting and, in severe cases, anaphylaxis.

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]

Nov 20, 2023 · Learn about different types of allergies, allergic reactions, their types, symptoms, and severity.

Mar 8, 2024 · What Is an Allergic Reaction? Some people sneeze like crazy. Others get itchy hives or watery eyes. But whatever the reaction, it boils down to one thing: allergies. If you have allergies,...

Apr 21, 2023 · An allergic reaction occurs when your body attacks a foreign, and typically harmless, substance. Learn about common allergens, allergy testing, and more.

Aug 24, 2024 · Diagnosis involves the steps that your healthcare professional takes to find out whether you have an allergy. Your healthcare professional will likely: Ask detailed questions about your symptoms. Do a physical exam. Have you keep a …

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.

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.

May 16, 2018 · Allergies can cause a variety of symptoms such as a runny nose, sneezing, itching, rashes, swelling, or asthma. Allergies can range from minor to severe. Anaphylaxis is a severe reaction that can be life-threatening. Doctors use skin and blood tests to …