Allergy is hyper reaction of the body’s immune system to the substances that are typically harmless to most people. These substances, called allergens, can trigger allergic reactions in sensitive individuals. Allergens can be found in various forms, such as pollen, dust mites, pet dander, certain foods, insect stings, and certain medications.

Allergic reactions can vary in severity, from mild symptoms like sneezing, itching, or a runny nose, to more severe symptoms like difficulty in breathing, swelling, or anaphylaxis, which is a life-threatening allergic reaction requiring immediate medical attention.

It can affect normally Eyes, Ear Nose and Throat (ENT), Lungs and Skin. Common allergies include hay fever (allergic rhinitis), allergic asthma, eczema, food allergies (such as to peanuts, shellfish, or dairy products), and insect sting allergies.

Treatment for allergy often involves avoiding allergens when possible, medications like antihistamines or nasal corticosteroids to alleviate symptoms, and allergy shots (immunotherapy) to desensitize the immune system to specific allergens.