A few cases cause severe asthma, anaphylaxis, or death.

Milk allergy can cause anaphylaxis, a severe, life threatening allergic reaction.

In adults, the foods most likely to cause anaphylaxis are peanuts, tree nuts, fish, and shellfish.

In extreme cases, a feather allergy can cause anaphylaxis, which is life threatening.

The health care provider will wait to test for the specific allergen that caused anaphylaxis (if the cause is not obvious) until after treatment.

The longer the time since the last exposure to the agent that caused anaphylaxis, the lower the risk of a new reaction.

In about 3% of cases, the sting causes anaphylaxis.

For example, the azole group of drugs is known to have caused anaphylaxis.

Allergy (type 1 hypersensitivity) to poppy seeds is very rare, but has been reported and can cause anaphylaxis.

Learn whether food allergies can cause anaphylaxis in this article.