Many ask about allergy developments. To understand it better, one should learn about its different categories. Once allergy antibodies have been form in a person's body in response to a particular allergen, an allergic reaction can occur when the person comes in contact with that allergen. The said allergens can be inhaled, eaten, injected, or contacted by the skin. When allergy antibodies are activated by an allergen, they cause body cells to release a substance called histamine, a chemical that dilates blood vessels, promotes fluid secretions, and stimulates nerves that cause muscles to spasm. These reactions create various allergy symptoms.
Eyes become itchy, red, and watery when pollen allergens affect it. When the allergens affect the lungs it causes emission of mucus and inflammation, swelling, and narrowing of the airways, that result in asthma. Symptoms include spasms of the airways and sudden difficulty in breathing.
Patients are sometimes surprised by the sudden start of allergies in adult life. This is able to occur when the combination of a person's genetic makeup and a longstanding but unnoticed reactivity to an allergen finally culminates in a detectable disease. This so-called allergic threshold is crossed when allergens finally produce enough reaction in the body to cause detectable symptoms.
Many people think that emotions, such as stress, cause allergies, but most physicians believe this is incorrect. In fact, the opposite may be true: People with allergies live with symptoms that can produce serious emotional upset.
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