Bee and Wasp Stings: Local Reaction vs. Anaphylaxis

Recognizing Anaphylaxis

The key distinction: anaphylaxis involves body systems distant from the sting site.

Signs of systemic allergic reaction (one or more triggers epinephrine):

• Hives, flushing, or itching distant from the sting site — appearing on the chest, back, face, or extremities away from the sting
• Swelling of the lips, tongue, or throat
• Difficulty swallowing or talking
• Difficulty breathing, wheezing, or tightening in the chest
• Nausea, vomiting, or cramping (when not caused by pain)
• Dizziness, fainting, or pale, cold, clammy skin
• Rapid or weak pulse
• Sense of impending doom (patients often describe this — take it seriously)

These signs near the sting site only are NOT anaphylaxis:

• Swelling at and immediately around the sting
• Pain and redness at the sting
• Even significant swelling confined to the surrounding area

Epinephrine Auto-Injector: Correct Use

Use immediately when anaphylaxis is suspected. Do not wait to see if symptoms resolve. Epinephrine is the only effective treatment for anaphylaxis.

EpiPen / Auvi-Q / Generic auto-injector:

1. Remove from carrier and take off safety cap (blue end on EpiPen)
2. Hold the device in your dominant hand, tip down
3. Place the orange tip against the outer thigh — midway between hip and knee
4. Can inject through clothing
5. Push down firmly until you hear/feel a click
6. Hold firmly in place for 10 seconds
7. Remove and massage the injection site for 10 seconds
8. Note the time

If no improvement in 5-10 minutes and a second auto-injector is available: Give a second dose. Most guidelines recommend two auto-injectors on hand for this reason.

After epinephrine:

• Position: if breathing is the main concern, let the patient sit up. If hypotension/faintness, lay flat with legs elevated.
• Call for emergency care or begin evacuation — even patients who respond to epinephrine require monitoring
• The epinephrine effect lasts 10-20 minutes. The allergic reaction has not been treated; it has been temporarily blocked.

Diphenhydramine (Benadryl) is an adjunct — not a substitute. It treats the histamine component of the reaction but does not affect leukotrienes or other mediators and works too slowly for the airway component of anaphylaxis. Give it in addition to epinephrine, not instead.

Biphasic Reaction: The Hidden Risk

Approximately 5-20% of anaphylactic reactions are biphasic — the initial reaction resolves (with or without treatment), then a second reaction occurs 1-12 hours later without additional exposure.

A person who appeared to recover from anaphylaxis is not safe to leave alone. They require observation for a minimum of 6-8 hours. In a field setting where evacuation is not immediately available, this means maintaining vigilance through the window of biphasic risk.

Signs of biphasic reaction are identical to the initial reaction. Treat with a second epinephrine dose.

Local Reaction Treatment

For normal and large local reactions — no epinephrine needed:

Remove the stinger if present. Bee stingers have a venom sac attached; it continues to pump venom for several minutes after detachment. Scrape it out sideways with a fingernail, card, or knife blade. Do not grab and squeeze (pushes more venom in). Speed of removal matters more than method.

Ice pack to the sting site — reduces pain and swelling.

Ibuprofen 400-600mg for pain and inflammation.

Diphenhydramine 25-50mg orally reduces itching and histamine-mediated swelling.

For large local reactions (extensive swelling of a limb):

• Continue ice and antihistamines
• Prednisone or prednisolone (if available) 40-60mg for 3-5 days significantly reduces the peak swelling and duration
• Watch for skin infection — large areas of damaged tissue can become secondarily infected

Elevation of the affected limb reduces swelling.

Mass Envenomation

Multiple stings — 50 or more in an adult, fewer in children — can cause systemic toxicity from venom overload even in non-allergic individuals.

Africanized honey bees ("killer bees") are present in the southern US from California to Florida and are known for aggressive mass stinging behavior. A standard European honey bee hive contains 10,000-60,000 bees; Africanized bees are more likely to mobilize the majority of the hive when defending.

Signs of mass envenomation toxicity:

• Fever, headache, nausea, vomiting
• Muscle weakness, rhabdomyolysis
• Hemolysis (dark urine from hemoglobin/myoglobin)
• Cardiac arrhythmias in severe cases
• Renal failure from myoglobin

Treatment: Aggressive IV fluids (to protect kidneys), symptomatic management, hospitalization. This is a medical emergency distinct from allergic anaphylaxis — the mechanism is direct venom toxicity, not immune-mediated.

Escape from mass stinging: Run in a straight line away from the hive. Do not swat (this releases alarm pheromone). Do not jump in water (the bees will wait). Get to an enclosed space (a car, a building). Cover the face as you run.

Who Should Carry Epinephrine

• Known hymenoptera (bee, wasp, hornet) venom allergy with prior systemic reaction — absolutely yes, two auto-injectors
• History of anaphylaxis to any cause — yes
• Asthma + stinging insect allergy — yes (asthma significantly worsens anaphylaxis outcomes)
• Any wilderness traveler staying for extended periods in remote areas without medical access — discuss with physician