Wasp Sting: Symptoms, Treatment & Allergy

What Is a Wasp Sting?

A wasp sting occurs when a wasp uses its stinger to inject venom into the skin as a defense mechanism. Unlike bees, wasps have a smooth stinger and can sting multiple times. Wasp stings are especially common during the summer months and are usually harmless for most people. However, for individuals with an allergy to insect venom, a wasp sting can become a life-threatening emergency.

Causes and Triggers

Wasps typically sting when they feel threatened. Common triggers include:

• Sudden movements near wasps
• Proximity to wasp nests
• Sweet foods and drinks consumed outdoors
• Brightly colored or floral clothing
• Strong perfumes or fragrances

Symptoms

Local Reaction (Normal)

In most people, a wasp sting causes a local reaction confined to the sting site:

• Immediate burning pain
• Redness and warmth at the site
• Swelling and itching
• Symptoms typically resolve within a few hours to days

Allergic Reaction

In people with an insect venom allergy, a wasp sting may trigger a more serious systemic response:

• Widespread skin swelling, hives, or urticaria
• Shortness of breath or chest tightness
• Dizziness, nausea, or vomiting
• Circulatory collapse or anaphylactic shock

Signs of an allergic reaction require immediate medical attention. Anaphylactic shock is a medical emergency.

Dangerous Sting Locations

Stings in or around the mouth, throat, or tongue can be dangerous even for non-allergic individuals, as swelling may obstruct the airway.

Diagnosis

The diagnosis of a wasp sting is typically based on the patient history and clinical examination. If an insect venom allergy is suspected, an allergist may perform:

• Skin prick test: Diluted insect venom is applied to the skin to check for a reaction
• Blood test (RAST/ImmunoCAP): Measures specific IgE antibodies against wasp venom in the blood

Treatment

First Aid for a Wasp Sting

• Stay calm and avoid agitating the sting area
• Apply a cold compress or ice pack wrapped in a cloth to reduce swelling
• Avoid scratching to prevent secondary infection
• Apply antiallergic or soothing gel or cream if needed

Medication

• Antihistamines (oral or topical): Relieve itching and swelling
• Corticosteroid cream: For stronger local reactions
• Pain relievers such as ibuprofen or paracetamol for significant pain

Emergency Treatment for Allergic Reactions

Individuals with a known wasp venom allergy should always carry an emergency kit containing:

• Adrenaline auto-injector (e.g., EpiPen)
• Antihistamine
• Corticosteroid tablets

In the event of anaphylactic shock, emergency services (911 or local emergency number) must be called immediately.

Immunotherapy (Hyposensitization)

For confirmed wasp venom allergy, allergen immunotherapy (hyposensitization) is an effective long-term treatment. The immune system is gradually desensitized to wasp venom through a series of controlled injections, significantly reducing the risk of severe future reactions. Success rates are very high.

Prevention

• Move calmly and slowly near wasps
• Cover sweet food and drinks when outdoors
• Avoid strong perfumes or scented products outdoors
• Wear shoes when walking outside
• Keep a safe distance from wasp nests

References

1. Deutsche Gesellschaft für Allergologie und klinische Immunologie (DGAKI): Guidelines on Insect Venom Allergy, 2022.
2. Muller UR - Insect Sting Allergy: Clinical Picture, Diagnosis and Treatment. Gustav Fischer Verlag, Stuttgart, 1990.
3. European Academy of Allergy and Clinical Immunology (EAACI): Guidelines on allergen immunotherapy – Hymenoptera venom allergy. Allergy, 2018.