Allergic contact dermatitis: A red, itchy, weepy reaction where the skin has come into contact with a substance that the immune system recognizes as foreign, such as poison ivy, poison oak or poison sumac or certain preservatives in creams and lotions. This type of reaction reflects a specific sensitivity or allergy to a specific substance. Also called allergic contact eczema.
- Allergic granulomatosis
Allergic granulomatosis: A disease (also often called the Churg-Straus syndrome) characterized by inflammation of the blood vessels in persons with a history of asthma or allergy. The symptoms of the Churg-Strauss syndrome include fatigue, weight loss, inflammation of the nasal passages, symptoms of asthma, numbness, and weakness. The ultimate test for the diagnosis of Churg-Straus […]
- Allergic reaction
The hypersensitive response of the immune system of an allergic individual to a substance. When an allergen enters the body, it causes the body’s immune system to develop an allergic reaction in a person with an allergy to it. This reaction can occur when the immune system attacks a normally harmless substance (the allergen). The […]
- Allergic rhinitis
Allergic rhinitis: Medical term for hay fever, an allergic reaction that mimics a chronic cold. Symptoms include nasal congestion, a clear runny nose, sneezing, nose and eye itching, and tearing of the eyes. Postnasal dripping of clear mucus frequently causes a cough, loss of smell is common, and occasionally loss of taste. Nosebleeds may occur. […]
- Allergic rhinitis, perennial
Allergic rhinitis, perennial: Allergic rhinitis that occurs throughout the year.
- Allergic rhinitis, seasonal
Allergic rhinitis, seasonal: Allergic rhinitis that occurs during a specific season.