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Wasp Sting: Symptoms, Treatment & Allergy

A wasp sting occurs when a wasp injects venom into the skin through its stinger. It causes pain, redness, and swelling – and in rare cases, serious allergic reactions.

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Things worth knowing about "Wasp Sting"

A wasp sting occurs when a wasp injects venom into the skin through its stinger. It causes pain, redness, and swelling – and in rare cases, serious allergic reactions.

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

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

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