The basic biological mechanism behind each of the allergic illnesses is almost identical. Repeated exposure to an allergen causes the body to release antibodies, which attach themselves to the surface of special cells called mast cells. It is actually the droppings from the millions of these tiny creatures that share our homes that can cause problems for allergic people, as well as be a major trigger for asthma. These mites especially flourish in bedrooms and sitting rooms, as they like warm, humid conditions and live on the abundant skin cells which we shed each day. Indoor or outdoor growths which release spores into the atmosphere, molds can also be implicated in asthma or explain why some people experience hay fever symptoms after the pollen season is over.
Hay fever is the condition most likely to be caused by pollen allergy.
From Spring through Autumn, grasses, trees and weeds release hundreds of varieties of pollens. Geographical considerations play an important role in pollen allergies, as well as environmental factors, such as global warming. Peanuts, eggs, milk and fish, in particular, are known to have caused problems for allergic people. A very small percentage of people have become so highly sensitized to certain bee and wasp stings that they can have life-threatening reactions, and they have to change their lifestyles accordingly. Other possible allergens for allergy-prone people are certain medications, chemicals, rubber, metal jewelry, plants, and even sunlight.