Allergens refer to substances that can cause an allergic reaction in individuals who are sensitive or allergic to them.

Allergens can be found in various forms, such as:

• Pollen: Tiny grains produced by plants for reproductive purposes and commonly responsible for seasonal allergies.
• Dust mites: Microscopic organisms found in house dust, bedding, and upholstery, which can trigger allergy symptoms.
• Pets: Proteins present in animal dander, saliva, or urine that can cause allergic reactions in susceptible individuals.
• Mold: Microscopic fungi that produce spores, leading to allergies when inhaled or touched.
• Insects: Allergies can be caused by bites or stings from insects like bees, wasps, mosquitoes, or from exposure to insect droppings.
• Food: Certain foods like peanuts, tree nuts, shellfish, eggs, milk, and wheat can trigger allergic reactions in some people.

Allergens stimulate the immune system, leading to a range of allergic reactions, including sneezing, itching, hives, swelling, respiratory problems, and in severe cases, anaphylaxis.