Allergies and Hypersensitivities - Temporary allergies

Occasionally, a change in the body's hormonal balance may trigger a hypersensitivity to a substance that previously had no effect on the individual. Pregnant women are especially susceptible to these temporary allergies, which almost always disappear after childbirth. Some women during pregnancy, on the other hand, experience complete relief from allergies that have plagued them since childhood.

People who suffer from seasonal allergies, such as hay fever, often have heightened allergic reactions to dust, animal dander, and even certain foods, such as chocolate and pineapple, during the season when ragweed pollen or other airborne allergens are plentiful.