Allergic inflammation occurs when the immune system reacts to a foreign substance that is generally harmless. This reaction causes swelling, redness, itching, and other similar symptoms in the affected area. There are several synonyms for the term "allergic inflammation." These include hypersensitivity reaction, allergy response, immune-mediated inflammatory response, allergic reaction, and allergen-induced inflammation. Other similar terms related to allergic inflammation include atopic dermatitis, hay fever, asthma, and eczema. Regardless of which synonym is used, it is important to recognize the signs and symptoms of allergic inflammation and seek medical attention promptly to prevent further complications.