Allergy symptoms can vary greatly from person to person, but some of the most common symptoms include RASH, WHEEZE, sneeze, red eyes, ITCH, POLLEN, asthma, and achoo. A RASH is a red or pink patch of skin that is usually itchy and can be caused by an allergic reaction. Wheezing is a whistling sound that occurs when breathing due to constriction of the airways. Sneezing is an involuntary expulsion of air from the nose and mouth. Red eyes are a common symptom of allergies, caused by inflammation of the conjunctiva, the thin membrane that lines the inner surface of the eyelids. Itchiness is another common symptom of allergies, which can be caused by contact with an allergen or by inhaling particles in the air. POLLEN is a common allergen that can cause allergic reactions in some people. Asthma is a chronic lung condition that can be triggered by allergens. Achoo is an informal term for sneezing.