When an allergen such as pollen enters the body of a person with a sensitized immune system, it triggers antibody production. Histamine and other chemicals are released by body tissues as part of the immune response. This causes itching , swelling of affected tissues, mucus production, muscle spasms , and other symptoms. Many disorders are associated with, triggered, or worsened by allergies. These include eczema , asthma , and many others.
Allergies are very common.
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