Stinging insects like bees, wasps, hornets, yellow jackets, or fire ants (the Hymenoptera family) inject venom when they sting their victims. In order to better understand stinging insect allergy, you need to be able to differentiate an allergic reaction from a normal local reaction. A normal reaction will result in pain, redness, and a swelling where the sting occurred.
An allergic reaction is when your immune system overreacts to an allergen, in this case, a sting. (Read more about allergies.) The first time an insect stings a person who is allergic, an antibody called immunoglobulin E (IgE) is produced. It is the IgE reacting with the insect venom that causes the reaction (release of histamine and other chemical mediators). There has to be at least one prior sting before an allergic response can occur. After a second sting by the same type of insect, the venom attaches itself to the IgE antibody and the reaction, this time usually more severe, is triggered. Yellow jackets and hornets tend to be cross reactive (a sting by one can lead to an allergy to both) while the others are not.
A normal reaction usually lasts for a few hours. Occasionally, the local reaction can be severe and last as long as two weeks. Allergic reactions to an insect sting can range from relatively mild symptoms like a short case of hives to severe anaphylaxis, which could be fatal. Symptoms of a severe allergic reaction (the first signs of anaphylaxis) are:
- Hives, itching, and swelling in areas other than the sting site
- Difficulty in breathing
- Difficulty swallowing
- Tightness in the chest
- Hoarse voice
- Feeling of a lump in the throat
- Swelling of the throat, tongue, face, or lips
- A feeling like there is something "very bad" or "very wrong"
This type of reaction will occur within minutes of exposure and may be life threatening. If you have had a severe allergic reaction to an insect sting, there is a 60 percent chance of similar or worse reactions if stung again.
Identifying Stinging Insects
In order to avoid stinging insects, it is important to learn what they look like and where they live.
- Black with yellow markings
- Queen -- ¾ inch long
- Male and workers -- ½ inch long
- Less common in the southwestern United States
- Nests are made of papier-mache material and are usually found underground, but are sometimes inside walls of framed building, in cracks in masonry, or in woodpiles.
- Black or brown with white, orange, or yellow markings
- Usually larger than yellow jackets, typically ¾ to 1 inch long
- Nests are gray or brown and football-shaped, made of papier-mache material, (similar to a yellow jacket nest) and are found high above ground on branches of trees, in shrubbery, or on gables.
- Brown with yellow markings
- ½ inch long
- Barbed stinger that is usually left in victim
- Dies after stinging
- Usually only stings when provoked
- Domesticated honeybees live in man-made hives
- Feral honeybees live in nests. Common sites for nests include holes in exteriors of homes, between fence posts, in old tires, or other partially protected sites.
- Reddish brown
- 1/8 inch long
- Live in colonies underground with a prominent mound
- Fire ant beds are found along borders of sidewalks, driveways, and along roadsides.
Black, brown, or red, usually with yellow markings
Identifying Stinging Insects / Avoiding Stinging Insects