An (substance that elicits an response)
is responsible for producing allergic reactions by inducing formation.
IgE antibodies, bound to in circulation and
in tissue, cause these cells to release
chemicals when they come into contact with an allergen. These chemicals can cause injury to surrounding tissue -
the visible signs of an allergy. An allergen can be almost anything which acts as an antigen to stimulate such an
. The most common are , ,
fish, eggs and nuts.
, especially ragweed, which causes hayfever.
from plants and food, which are most likely to cause asthma.
, which contains as well as
Venom from (such as bees, wasps and mosquitoes) or scorpions.
Plant Oils, especially ivy, oak or sumac.
Additionally, feathers, wool, dyes, cosmetics and perfumes may also act as allergens.