An allergic reaction is an exaggerated immune response to a substance that is generally not harmful to most people. The substance that triggers the allergic reaction is called an allergen. Common allergens include certain foods, pollen, insect stings, medications, and various environmental factors. When an individual with allergies comes into contact with an allergen, their immune system perceives it as a threat and responds by releasing chemicals such as histamines. These chemicals lead to the symptoms associated with allergies. Allergic reactions can vary widely in severity, ranging from mild symptoms like sneezing and itching to severe and life-threatening reactions known as anaphylaxis. Common symptoms of an allergic reaction may include: Skin reactions: Itching, hives, eczema, or swelling. Respiratory symptoms: Sneezing, coughing, wheezing, shortness of breath, or a runny or stuffy nose. Digestive symptoms: Nausea, vomiting, diarrhea, or abdominal pain. Eye symptoms: Redness,...
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