Apr 1, 2025 · Allergies are your immune system’s overreaction to foreign substances. When you touch, inhale or eat something you’re allergic to, your body thinks it’s harmful and reacts to try to get rid of it. …

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 …

Dust mite allergy, also known as house dust allergy, is a sensitization and allergic reaction to the droppings of house dust mites. The allergy is common [41][42] and can trigger allergic reactions such …

4 days ago · National allergy forecast for USA cities Today’s National Allergy Map Search, browse and select cities on our interactive allergy map to see allergy levels and pollen count forecasts.

Jul 7, 2025 · 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.

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 …

Nov 20, 2023 · In many places in the U.S., there are two allergy seasons: spring and fall. Allergies that you get at similar times each year (seasonal allergies) are usually caused by pollen from trees,...

Nov 19, 2025 · An allergy is a reaction by your immune system. Substances that cause reactions include pollen and food. Find the full list of allergies and symptoms.

May 19, 2024 · An allergy is a treatable condition in which the body has a reaction—ranging from hives to trouble breathing—to allergens like food, pollen, or dust.

An overview of allergy symptoms, allergy diagnosis, allergy treatment and allergy management written by AAAAI's leading experts in allergy, asthma and immunology.