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Allergies occur when your immune system reacts to normally harmless substances such as pollen, dust, or pet dander. This overreaction releases chemicals like histamine, which cause symptoms such as sneezing, itching, or watery eyes. Allergies can range from mild seasonal hay fever to more persistent year-round sensitivities.
Allergies are caused by an overactive immune response to allergens like pollen, mould, animal fur, or certain foods. Your body mistakenly identifies these substances as harmful and releases histamine to fight them off. This leads to typical allergy symptoms such as sneezing, itching, or congestion.
The common allergy symptoms include sneezing, nasal congestion, itchy or watery eyes, and a runny nose. Some people may also experience itchy skin, rashes, or swelling. The severity of symptoms often depends on the type of allergen and how sensitive your body is to it.