Allergy
Allergy is a disorder of the immune system. To be more precise, allergy is a form of hypersensitivity characterized by excessive activation of certain white blood cells called by a type of antibody known as IgE, resulting in an extreme inflammatory response. Common allergic reactions include eczema, hives, hay fever, asthma, food allergies, and reactions to the venom of stinging insects.
The development of an allergy can be linked to two main risk factors:
- Host factors, i.e. genetic factor such as heredity, sex, race, age
- Environmental factors, i.e. exposure to infectious diseases during childhood, environmental pollution, allergen levels, dietary changes
Mild allergies like hay fever are highly prevalent in the human population and cause symptoms such as allergic conjunctivitis, itchiness, and runny nose. Allergies can play a major role in conditions such as asthma. In some people, severe allergies to environmental or dietary allergens or to medication may result in life-threatening anaphylactic reactions and potentially death.
| Allergens |
Allergic reaction |
| Dust or pollen |
irritation of the sìnose, sneezing, itching and redeness of the eyes, asthma |
| Food |
adbominal pain, bloating, vomiting, diarrhea, itchy skin, hives |
| Insects |
cutaneous reactions, bronchoconstriction, edema, hypotension, coma, and even death |
| Antibiotics and other drugs |
cutaneous reactions, bronchoconstriction, edema, hypotension, coma, and even death |
| Latex and other substance that come into contact with the skin |
contact dermatitis or eczema, hives, rashes |
Source: Wikipedia
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