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).
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.
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.
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.
This tool is for educational purposes only. It is NOT
intended for diagnostic purposes. Only a physician or
licensed provider may diagnose and treat diseases. Read the
Terms and Conditions and
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A disease calculator that uses hundreds of thousands of
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