Allergies occur when the immune system reacts to environmental substances that are harmless to most people.
Common allergens are food, pollen, dust mites, animals, insect st...
Most allergic reactions are only mild to moderate and can effectively be treated with antihistamines. But other reactions can be life-threatening and require emergency medical treatment.
Allergies are becoming more frequent in the western world. One in twenty will develop a food allergy in their life, and one in 100 will have a life-threatening allergic reaction.
Theories for why the number of allergies is rising:
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