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Allergies develop when your immune system reacts to a foreign substance or food that normally causes no reaction in most people.
Your body produces chemicals called antibodies to fight dangerous germs. Allergic reactions are caused by the immune system producing antibodies to mistakenly combat a harmless substance. Common allergens include pollen, pet dander, insect stings, or certain foods. Your immune system's reaction to an allergen might inflame your skin, sinuses, lungs, or digestive tract when you come into contact with it.
Allergies vary in intensity from person to person. An allergic reaction may range from slight discomfort to anaphylaxis, a potentially fatal medical emergency. While most allergies are incurable, some therapies can help alleviate allergy symptoms.