What are allergies describe its symptoms in brief?

Question: What are allergies describe its symptoms in brief?

Allergies are abnormal reactions of the immune system to substances that are usually harmless. These substances, called allergens, can trigger symptoms such as sneezing, itching, rash, swelling, or difficulty breathing. Some common allergens are pollen, dust mites, animal dander, mold, food, insect stings, and drugs. Allergies can affect different parts of the body, such as the nose, eyes, skin, lungs, or digestive system. Allergies can range from mild to severe and sometimes life-threatening. The best way to prevent allergies is to avoid the allergens that cause them.

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