An allergy is a hypersensitivity disorder of the immune system. Allergic reactions occur when a person's immune system reacts to normally harmless substances in the environment. A substance that causes a reaction is called an allergen. These reactions are acquired, predictable, and rapid. Allergy is one of four forms of hypersensitivity and is formally called type I (or immediate) hypersensitivity. Allergic reactions are distinctive because of ex...
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Parent Disease:
Diseases with this Risk Factor:
- Pharyngitis ,
- Laryngitis ,
- Dyshidrosis ,
- Urticaria ,
- Otitis externa ,
- Ménière's disease ,
- Premenstrual syndrome
Also known as:
- Hypersensitivity,
- Allergies,
- Winter allergies,
- Persil allergies
