An allergy is a reaction of your immune system to something that does not bother most other people. People who have allergies often are sensitive to more than one thing.
Substances that often cause reactions are PollenDust mitesMold sporesPet danderFoodInsect stingsMedicines
How do you get allergies? Scientists think both genes and the environment have something [...]

If an expectant mother is exposed to high levels of stress, her baby may be more likely to develop asthma or allergies later in life, new research suggests.
Babies born to mothers experiencing high levels of stress had more IgE in their blood at birth than did babies born to less-stressed moms. IgE is an antibody [...]