Insect Allergies

Most of us develop redness and swelling at the site of an insect bite. Yet people who are allergic to stinging insect venom are at risk for a much more serious reaction. This life-threatening reaction is called anaphylaxis.

Understanding differences in symptoms between a normal reaction and an allergic reaction can bring peace of mind. It is also important to have an accurate diagnosis so you can manage your condition and be prepared for an emergency.

An allergic reaction occurs when the immune systemoverreacts to an allergen. In stinging insect allergy, the allergen is venom from a sting. Most serious reactions are caused by five types of insects: yellow jackets, honeybees, paperwasps, hornets and fire ants.


Most people develop pain, redness and swelling at the site of an insect sting. This is a normal reaction that takes place in the area of the bite.

A serious allergic reaction occurs when the immune system gets involved and overreacts to the venom, causing symptoms in more than one part of the body such as:

  • Swelling of the face, throat or tongue
  • Difficulty breathing
  • Dizziness
  • Stomach cramps
  • Nausea or diarrhea
  • Itching and hives over large areas of the body

This severe allergic reaction is called anaphylaxis.

Insect stings can cause serious symptoms that are not allergic. A toxic reaction occurs when the insect venom acts like a poison in the body. A toxic reaction can cause symptoms similar to those of an allergic reaction including nausea, fever, swelling at the site of the sting, fainting, seizures, shock and even death. A toxic reaction can happen after only one sting but it usually takes many stings from insects.

Serum sickness is an unusual reaction to a foreign substance in the body that can cause symptoms hours or days after the sting. Symptoms include fever, joint pain, other flu-like symptoms and sometimes hives.


If you think you might be allergic to stinging insects, an accurate diagnosis is essential. Our allergists have has specialized training and skills to help in determining the cause of your symptoms. Your allergist will conduct a thorough health history followed by allergy testing to determine what, if any, allergens put you at risk for serious reactions to stinging insects.

Avoiding contact with stinging insects is the key to successfully managing this allergy. These steps can help:

Insects are most likely to sting if their homes are disturbed so have hives and nests around your home destroyed.

Be very careful as this activity can be dangerous so you should hire a trained exterminator.

If you spot stinging insects, remain calm, quiet, and slowly move away.

Avoid brightly colored clothing and perfume when outdoors. Many stinging insects are searching for food and could confuse you with a flower.

Be careful outdoors when cooking, eating or drinking sweet beverages like soda or juice. Cover food and drinks to keep insects out.

Wear closed-toe shoes outdoors and avoid going barefoot to steer clear of stepping on a stinging insect.

Avoid loose-fitting garments that can trap insects between material and skin.


If you have an anaphylactic reaction, inject epinephrine immediately and call 911.

Immunotherapy(allergy shots) may be an effective long-term treatment for stinging insect allergy. An allergist will give you shots containing small doses of your allergen, allowing your body to build a natural immunity to the trigger.