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Allergies occur when your immune system overreacts to a usually harmless substance. Learn to identify what's causing them and how to treat them. Although peanut allergies are notorious for their severity, peanut allergies are not the most common food allergy in adults or children. Severe or life-threatening reactions may be triggered by other allergens and are more common when combined with asthma. Learn about the common types of allergies , such as seasonal, food, skin, insect sting, and drug allergies . Find out how they are caused, diagnosed, and treated, and how to prevent them. In this article, we will explore the “What is an allergy?”, what are the most common allergies , their symptoms, and various treatment options available. Seasonal allergies , also known as hay fever or allergic rhinitis, are triggered by outdoor allergens such as pollen, grass, or mould spores.