Aug 24, 2024 · Overview Allergies happen when the immune system reacts to a foreign substance that gets inside the body. These substances are known as allergens. They include …

Aug 24, 2024 · Treatment Allergy treatments include: Staying away from allergy triggers, also known as avoidance. Your healthcare professional helps you take steps to spot and stay away …

Mar 28, 2025 · Allergy medicines are available as pills, liquids, inhalers, nasal sprays, eye drops, skin creams and shots, also called injections. Many allergy medicines are available without a …

Aug 30, 2024 · Overview Food allergy is an immune system reaction that happens soon after eating a certain food. Even a tiny amount of the allergy-causing food can trigger symptoms …

Mar 25, 2025 · Overview Peanut allergy is a condition that causes the body's germ-fighting immune system to react to peanuts. It's one of the most common causes of a life-threatening …

Sep 20, 2025 · Penicillin allergy is a reaction of the immune system to the antibiotic medicine penicillin. Penicillin is used to treat bacterial infections. Penicillin allergy may cause hives, rash …

Aug 11, 2025 · Egg allergy symptoms vary from person to person. They usually happen soon after eating an egg or a food made with egg. Egg allergy symptoms can include: Skin swelling …

Oct 22, 2025 · Coronavirus disease 2019 (COVID-19) can cause many of the same symptoms as the common cold, seasonal allergies and the flu. So how can you tell if you have COVID-19? It …

A Mayo Clinic expert discusses which medicines to avoid if you have a sulfa allergy.

Feb 4, 2025 · People with asthma often also have allergies. Find out how to control both conditions.