Listing concepts that match "allergy"

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Allergy
A disorder in which the immune system is triggered to react to certain specific, usually harmless, substances in the environment (allergens), leading to a rapid and predictable set of symptoms (allergic reaction).
Food allergy
An intolerance to certain foods, triggered by the immune system, leading to trouble breathing or swallowing, abdominal pain, skin rash, diarrhea, or vomiting. Not all poor reactions to specific foods (such as lactose intolerance or celiac disease) are allergies.
Allergy to animals
An allergy is an abnormal reaction by the immune system to a normal substance, leading to a predictable pattern of symptoms. In the case of an allergy to animals, it is often caused by tiny particles in the air from the animal's dead skin, urine, or saliva. Symptoms range from mild to potentially life threatening.
Conjunctivitis due to allergy
An inflammation of the outer membrane of the eyeball due to allergies. An allergy is an abnormal reaction by the immune system to a normal substance (often particles in the air), leading to a predictable pattern of symptoms.
Seasonal allergies (hay fever)
A reaction of the immune system to pollen and/or certain other substances in the air. This abnormal reaction can result in runny nose and itchy red eyes.

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