I had hives all over my body after a sting — was that anaphylaxis?

Yes. Generalized urticaria (hives away from the sting site) is a systemic reaction and meets ACAAI criteria for anaphylaxis. In adults, this type of reaction warrants allergist evaluation and venom immunotherapy consideration. In children, isolated hives without respiratory or cardiovascular symptoms carry a lower future-reaction risk, and pediatric allergists may manage these cases differently — consult your child's doctor and do not estimate dosing independently.

I was stung 10+ times — is that the same as an allergic reaction?

Not necessarily. Multiple stings can cause a toxic envenomation reaction — nausea, fever, vomiting, and malaise — that mimics allergy but operates through a different mechanism. Either way, 10 or more stings in a child or 50+ in an adult warrant ER evaluation regardless of allergy history. The direct toxic-dose threshold for a non-allergic adult is approximately 500 stings (NIH/PMC peer-reviewed case literature) — much higher, but multiple stings still need medical attention.

Can I be allergic to my first known yellow jacket sting?

Yes, though uncommon. Allergic sensitization generally requires prior exposure (which may have been unnoticed). However, cross-reactivity with other Vespid venoms can pre-sensitize someone who was previously stung by a related species. Any systemic symptoms after a first sting are a medical emergency regardless of mechanism.

Is yellow jacket sting allergy hereditary?

No simple inheritance pattern exists. Having hay fever, food allergy, or a family history of allergic disease does not raise your risk of insect-sting allergy (Anaphylaxis UK). Sting allergy is a distinct IgE-mediated response to Hymenoptera venom proteins — unrelated to other allergic conditions.

How many epinephrine auto-injectors should I carry?

Two. Biphasic anaphylaxis occurs in about 20% of initial anaphylactic reactions (Allergy & Asthma Network), and a second epinephrine dose is appropriate if there is no improvement 5–15 minutes after the first (ACAAI). Both auto-injectors should be kept together, not left in a car or locker. Replace by the expiration date.

Can I drive myself to the ER during an allergic reaction?

No. Epinephrine causes tremor and tachycardia that impair driving, and anaphylaxis can cause sudden syncope — loss of consciousness without warning. Use your epinephrine auto-injector, call 911, and lie flat until EMS arrives. Do not get behind the wheel (ACAAI; Cleveland Clinic).

What does an epinephrine auto-injector cost without insurance?

Brand-name two-packs commonly run $650–$735 without insurance. Generic and authorized-generic equivalents are equally effective and cost from approximately $100 (e.g., the CVS authorized generic for Adrenaclick has been offered at $109.99 for a two-pack). NH Medicaid is more likely to cover the generic than the brand. Ask your prescriber to write for 'epinephrine auto-injector' so the pharmacy can fill the lowest-cost equivalent. No specific brand is recommended.

How long does venom immunotherapy (VIT) last?

A typical course is 3–5 years (ACAAI). Protection persists in most patients after completing treatment, particularly for those whose initial reaction was not severe. People with very severe initial reactions or honeybee allergy (which may require separate venom) may be advised to continue maintenance indefinitely. This is a personalized decision made with your allergist.

Can my child receive venom immunotherapy?

Yes, for moderate-to-severe systemic reactions. The decision depends on the severity and type of reaction — for example, children who had only generalized urticaria without respiratory or cardiovascular involvement may not need VIT, as future-reaction risk is lower in that group. Your child's allergist will assess after venom skin testing or specific-IgE blood testing. Do not estimate pediatric medication doses — call NNEPC 1-800-222-1222 (24/7) or a pediatrician for guidance.

Will antihistamines or steroids prevent anaphylaxis?

No. Antihistamines do not reverse airway swelling or hypotension. Steroids have a slow onset and their role in preventing biphasic reactions is uncertain (UpToDate). Neither replaces epinephrine — both are adjuncts, not primary treatment (ACAAI verbatim). The protective strategy for allergic individuals is: avoidance of nests, carry two epinephrine auto-injectors at all times, wear a medical-alert ID, and pursue VIT.

Should I take Benadryl before going outdoors if I'm allergic?

No. Pre-treating with antihistamines can mask early anaphylaxis warning signs and delay recognition of a systemic reaction. The correct strategy is avoidance (not being near nests), carrying two prescribed epinephrine auto-injectors, wearing a medical-alert bracelet, and completing venom immunotherapy if you qualify — not pharmacological blunting of early symptoms (ACAAI).

My dog had hives and vomiting after a sting — is that an emergency?

Yes. Dogs can develop anaphylaxis from yellow jacket stings within minutes. Hives under the fur, vomiting, facial swelling, labored breathing, sudden weakness, or pale gums require immediate emergency veterinary care. NH 24/7 emergency vets: Veterinary Emergency Center of Manchester at (603) 666-6677 or Port City Veterinary Referral Hospital in Portsmouth at (603) 433-0056. Never give dogs or cats human ibuprofen, naproxen, or aspirin — all are toxic.

StingAnchor Pest · New Hampshire

Yellow Jacket Sting Allergic Reaction — Anaphylaxis Signs, When to Call 911 & Venom Immunotherapy (NH)

TL;DR

Most yellow jacket stings are not allergic, but per ACAAI potentially life-threatening allergic reactions occur in 0.4–0.8% of children and about 3% of adults over a lifetime; anaphylaxis usually begins within 5–30 minutes. If you see trouble breathing, throat tightness, spreading hives, dizziness, vomiting, or a sense of doom: epinephrine FIRST, then 911 — and always go to the ER afterward because of biphasic risk (~20%). Venom immunotherapy is up to 98% effective (ACAAI). NH emergency: 911, then NNEPC 1-800-222-1222.

Call for a free yellow jacket quote (603) 785-0118

NH License #782664Family-owned since 2017Updated Jun 2026

Anaphylaxis onset
5–30 min
rare up to 1–2 hr; ACAAI; Cleveland Clinic
Adult lifetime risk
~3%
systemic reaction; ACAAI reviewed 6/28/2023
Child lifetime risk
0.4–0.8%
systemic reaction; ACAAI reviewed 6/28/2023
U.S. sting deaths/yr
≥40
Annals of Allergy, Asthma & Immunology

Overview

If You're Seeing This After a Sting — What to Do First

This page leads with emergency information because that is what is needed here. If you or someone near you has symptoms away from the sting site — throat tightness, trouble breathing, spreading hives, dizziness, fainting, vomiting, or a sense of doom — those are anaphylaxis signs. The protocol is: epinephrine auto-injector (EpiPen / Auvi-Q / generic equivalent) into the outer thigh FIRST, then call 911. Do not drive yourself. Do not rely on antihistamines or inhalers — neither reverses airway swelling or hypotension (ACAAI).

Anaphylaxis from yellow jacket venom typically begins within 5–30 minutes of the sting. About 20% of the time, symptoms can return hours after initial control — the biphasic reaction — which is why ER observation for approximately 4–6 hours after epinephrine use is standard. At least 40 Americans die from anaphylactic sting reactions each year (Annals of Allergy, Asthma & Immunology).

If the emergency is past and you're reading this for context: venom immunotherapy (VIT) is up to 98% effective at preventing future reactions (ACAAI) and is available from several Manchester-area allergists listed below. The environmental intervention that complements VIT is removing yellow jacket nests on your property — a colony with 1,000–5,000 workers at August peak means repeated exposure risk until the nest is gone.

New Hampshire context

Yellow Jacket Anaphylaxis Risk in Southern New Hampshire

Southern New Hampshire's two dominant yellowjacket species — the Eastern yellowjacket (Vespula maculifrons, native ground nester) and German yellowjacket (V. germanica, invasive wall-void specialist) — peak from mid-August through mid-September, exactly when outdoor activity is highest and sting incidents are most frequent. For allergic individuals in Manchester, Nashua, Concord, Derry, and Bedford, the combination of late-summer aggression and dense colony populations (1,000–5,000 workers at peak) creates the highest exposure window of the year. NH has four 24/7 Level II–III emergency departments within Anchor's service area, the Northern New England Poison Center covering NH/ME/VT 24/7, and five Manchester-area allergy practices offering Hymenoptera venom testing and immunotherapy. Per UNH Cooperative Extension and NH DHHS, yellowjacket activity collapses with the first hard frost — approximately October 19 at 50% probability in Manchester per NOAA Manchester-Boston Regional Airport 1991–2020 normals.

Species present in NH

Eastern yellowjacket (V. maculifrons)
German yellowjacket (V. germanica)
Bald-faced hornet (D. maculata)
Aerial yellowjacket (D. arenaria)

Peak activity

mid-August through mid-September

Service area

ManchesterNashuaConcordDerryBedfordSalemHudsonAmherst

First-frost anchor: Manchester first hard frost ~Oct 19 (50%) / Oct 29 (80%) per NOAA Manchester-Boston Regional Airport

Per UNH Cooperative Extension, yellowjacket colonies in NH peak in late summer when food-source competition intensifies, making late-August through September the highest-risk period for allergic individuals.

Symptom tiers

Three reactions — local, large local, anaphylaxis

Three buckets cover essentially every yellowjacket sting. The big jump in risk happens between tier 2 and tier 3.

Tier 1

Local Reaction

Tier 2

5–10% of stings

Large Local Reaction

Tier 3

Systemic Reaction (Anaphylaxis)

Tier 1

Local Reaction

Who gets it

~90% of stings

What to expect

Pain, redness, swelling, warmth, and itch at the sting site — under 4 inches across. Resolves in 3–7 days. This type of reaction does NOT indicate venom allergy and carries no elevated future-anaphylaxis risk beyond population baseline (~3% adults, ACAAI).

What to do

Home first-aid: ice, one oral antihistamine, ibuprofen, 1% hydrocortisone cream. See /yellow-jacket-sting-treatment for the full 10-step protocol.

Tier 2

Large Local Reaction

Who gets it

~5–10% of stings

What to expect

Swelling over 4 inches or involving an entire limb; peaks 48–72 hours; resolves 5–10 days; may include low-grade fever and fatigue. Alarming but NOT anaphylaxis. NOT an indicator of systemic venom allergy. Future systemic-reaction risk is only 5–10% per AAFP — large-local reactors are generally NOT candidates for venom immunotherapy.

What to do

See a clinician within 24 hours for possible prednisone. Watch for any systemic symptoms developing — if they appear, treat as anaphylaxis.

Tier 3

Systemic Reaction (Anaphylaxis)

Who gets it

<1% of stings; lifetime risk ~3% adults / 0.4–0.8% children (ACAAI)

What to expect

Multi-system reaction within 5–30 minutes: respiratory, cardiovascular, dermatologic, GI, neurological signs away from the sting site (ACAAI). After one systemic reaction, re-reaction risk ranges from 10–15% (mildest reactions and some children) to up to 70% in adults with severe recent reactions (AAFP). IS a venom immunotherapy candidate.

What to do

Epinephrine FIRST — auto-injector (EpiPen / Auvi-Q / generic equivalent) into outer thigh. Call 911 SECOND. Lay flat unless vomiting. ER follow-up mandatory — biphasic risk ~20%. See allergist afterward for VIT evaluation.

Time-critical

Schmidt sting pain index

How bad does a yellowjacket sting really hurt?

The Schmidt pain index rates yellow jackets at 2.0 — 'hot and smoky, almost irreverent.' On this page, the pain index is context only. What matters here is onset timing: anaphylaxis begins within 5–30 minutes of the sting, not from the pain itself.

Sweat bee
1.0
Light and ephemeral, almost fruity
Fire ant
1.2
Sharp, sudden, mildly alarming
Bald-faced hornet
2.0
Rich, hearty, slightly crunchy
Yellow jacketYellowjacket
2.0
Hot and smoky, almost irreverent
Honey bee
2.0
Like a matchhead pressed into the skin
Paper wasp
3.0
Caustic and burning, with a distinctly bitter aftertaste
Bullet ant
4.0
Pure, intense, brilliant pain — like walking over flaming charcoal

Recovery timeline

What happens hour-by-hour after a sting

0–10 min
Sharp burning pain and immediate redness at the sting site. THIS IS THE CRITICAL WINDOW — anaphylaxis begins in this period or in the next 20 minutes in most cases.
Action: Observe closely for any symptom away from the sting site. Use epinephrine immediately at first systemic sign — do not wait for multiple symptoms.
Moderate
5–30 min
Anaphylaxis onset window. Systemic symptoms can appear: hives spreading beyond the sting site, throat tightness, wheezing, dizziness, fainting, vomiting, rapid or weak pulse, or sense of impending doom (ACAAI; Cleveland Clinic).
Action: Epinephrine FIRST into outer thigh (even through clothing), then call 911. Lay flat with legs raised unless vomiting or struggling to breathe. Do not drive.
911 / Emergency
Up to 1–2 hr
Rare but documented late anaphylaxis onset. Some individuals develop systemic symptoms up to 1–2 hours post-sting (ACAAI). Continued monitoring is warranted for known allergic individuals.
Action: Any systemic symptom at this time is still anaphylaxis. Epinephrine first, 911 second.
911 / Emergency
1–72 hr (biphasic window)
Biphasic anaphylaxis — return of systemic symptoms after initial resolution. Occurs in about 20% of anaphylactic reactions (Allergy & Asthma Network). Epinephrine's clinical effect lasts only 15–20 minutes, but the underlying process can outlast it.
Action: ER observation for approximately 4–6 hours after epinephrine use is standard. A second epinephrine dose may be needed. Go to the ER — biphasic risk is why discharge home after epinephrine use alone is not safe.
911 / Emergency
3–5 years (VIT course)
Venom immunotherapy: gradual desensitization through increasing doses of purified venom. Up to 98% effective at preventing future systemic reactions (ACAAI patient page; 85–98% per JACI).
Action: Consult an allergist for venom skin testing or specific-IgE blood testing; candidacy = any prior systemic (anaphylactic) reaction.
Mild

First-aid protocol · step-by-step

Eight steps — the home protocol that actually works

01
Inject epinephrine FIRST — outer thigh
Use an epinephrine auto-injector (any FDA-approved equivalent: EpiPen, Auvi-Q, or generic) into the anterolateral mid-thigh — through clothing if necessary. Adult dose: 0.3 mg IM (World Allergy Organization). If you have asthma and are unsure whether symptoms are asthma or anaphylaxis, give epinephrine first.
No specific brand is recommended. Brand-name and lower-cost generic/authorized-generic auto-injectors are equally effective.
02
Call 911 SECOND
After using epinephrine, call 911 and inform them you used epinephrine for a sting anaphylaxis. Request an ambulance — do not drive yourself.
Epinephrine causes tremor and tachycardia that impair driving. Sudden syncope during anaphylaxis is a real risk (ACAAI; Cleveland Clinic).
03
Position: flat with legs raised 12 inches
Lay the person flat and raise legs about 12 inches to help maintain blood pressure. Exception: if they are vomiting or struggling to breathe, let them sit in a position of comfort; if unconscious, place on their side.
Do not stand the person up — orthostatic drop in blood pressure can cause immediate collapse.
04
Give a second dose if no improvement in 5–15 min
If symptoms do not improve or worsen after 5–15 minutes, a second epinephrine dose is appropriate and consistent with ACAAI guidance. This is why carrying two auto-injectors is essential.
Antihistamines and inhalers are NOT substitutes and must not delay giving a second epinephrine dose if needed (ACAAI).
05
Always go to the ER — even if symptoms resolve
Biphasic anaphylaxis occurs in about 20% of anaphylactic episodes (Allergy & Asthma Network). Symptoms can recur hours after the initial reaction clears. ER observation of approximately 4–6 hours after epinephrine use is standard (Cleveland Clinic; Mayo Clinic).
Steroids and antihistamines may be given in the ER as adjuncts, but their role in preventing biphasic reactions is uncertain (UpToDate). ER observation is mandatory regardless.
06
See an allergist after the event for VIT evaluation
Any prior systemic (anaphylactic) reaction is an indication for allergist evaluation and venom skin testing or specific-IgE blood testing. Venom immunotherapy is up to 98% effective at preventing future reactions (ACAAI). Manchester-area allergists who offer Hymenoptera venom testing are listed in the section below.

Emergency · do not miss

Red flags — call 911 immediately

Emergency · red flags

Anaphylaxis affects multiple body systems simultaneously, with onset 5–30 minutes after the sting. Any single sign below in a different body system from the sting site is enough to trigger epinephrine first, then 911.

Warning signs

Respiratory: wheezing, throat tightness, hoarse voice, persistent cough, difficulty breathing or swallowing
Cardiovascular: weak or rapid pulse, dizziness, fainting, pale or clammy skin, low blood pressure
Dermatologic: hives or itching spreading away from the sting site, facial or lip or tongue swelling, generalized flushing
GI: nausea, vomiting, diarrhea, abdominal cramping within minutes of the sting
Neurological: sense of impending doom, confusion, sudden weakness or collapse

Call 911 when

Any of the above signs appear — epinephrine first, then 911
Sting to the mouth or throat — airway swelling risk regardless of allergy history
Known venom allergy — even before symptoms develop
Person cannot self-administer epinephrine and is showing systemic signs
First epinephrine dose shows no improvement after 5–15 minutes — second dose and 911

5 ERs · 1 Poison Center · 24/7

New Hampshire emergency contacts

For anaphylaxis, call 911 first. These NH emergency departments are open 24/7. NNEPC 1-800-222-1222 for poison and dosage questions. VA Manchester is NOT 24/7 — veterans must go to Elliot or CMC for emergencies.

Poison center · NH, ME, VT

Northern New England Poison Center

24/7 · Text POISON to 85511

1-800-222-1222

Manchester, NH

Catholic Medical Center

100 McGregor St, Manchester, NH 03102

Level III adult / Level IV pediatricER 24/7

(603) 668-3545

Manchester, NH

Elliot Hospital

1 Elliot Way, Manchester, NH 03103

Level IIER 24/7Pediatric ER

(603) 669-5300

NH's only dedicated Pediatric ED; Level II adult trauma (ACS-verified)

Manchester, NH

VA Manchester Healthcare System

718 Smyth Rd, Manchester, NH 03104

(603) 624-4366

NOT 24/7 — Urgent Care only, 7 days 8:00 a.m.–4:30 p.m. Veterans requiring emergency care must go to Elliot Hospital or Catholic Medical Center.

Nashua, NH

Southern New Hampshire Medical Center

8 Prospect St, Nashua, NH 03060

Level IIIER 24/7

(603) 577-2000

Concord, NH

Concord Hospital

250 Pleasant St, Concord, NH 03301

Level II adult + Level III pediatricER 24/7

(603) 225-2711

Level II adult (ACS-verified) + Level III pediatric; busiest ED in NH (74,837 visits FY2024)

Long-term protection

Venom immunotherapy — the only cure for sting allergy

Venom immunotherapy

Venom immunotherapy (VIT) is the only treatment that reduces the risk of a future anaphylactic reaction to near-population baseline. If you have had any systemic reaction to a yellow jacket sting, ask your allergist about VIT after venom skin testing or specific-IgE blood testing confirms sensitization.

Effectiveness data: ACAAI patient page (up to 98% protection); Journal of Allergy and Clinical Immunology (85–98% effective, Golden et al.)

Effectiveness

85–98%

Course

3–5 years

Candidacy

Any prior systemic (anaphylactic) reaction confirmed by venom skin testing or specific-IgE blood testing. Large-local-only reactors generally are not VIT candidates — future systemic-reaction risk is only 5–10% after large-local reactions (AAFP). Pediatric cases: moderate-to-severe systemic reactions may qualify; isolated urticaria in children typically does not.

NH allergy practices

Manchester Allergy, Inc. (Dr. John Kalliel)
Manchester · 765 South Main St, Suite 203, Manchester, NH 03102
(603) 668-6444
Southern New Hampshire Asthma & Allergy
Nashua · 19 Tyler St, Suite 104, Nashua, NH 03060
(603) 273-9012
Allergy & Asthma Specialists, PC
Nashua · 505 West Hollis St, Suite 101, Nashua, NH 03062
(603) 881-7433
Dartmouth Health Allergy & Clinical Immunology
Nashua / Bedford / Concord · Nashua: 2300 Southwood Dr; Bedford: 5 Washington Pl; Concord: 253 Pleasant St
(603) 577-4435
Dr. Joan Cassettari, DO (Dartmouth Health Concord)
Concord · 253 Pleasant St, Concord, NH 03301
(603) 228-4548

Pet sting

What to do if your dog or cat is stung

Dogs and cats can develop anaphylaxis from yellow jacket stings within minutes. Dogs most often get stung in the mouth or throat from snapping at flying insects — where swelling can obstruct the airway regardless of allergy. Cats are more often stung on paws or face. NEVER give pets human ibuprofen, naproxen, or aspirin — all are toxic to dogs and cats. For any sign below, go immediately to an NH emergency veterinary clinic.

Airway-risk signs

Vomiting or diarrhea within minutes of a sting
Facial, muzzle, or neck swelling
Hives visible under the fur
Labored breathing, wheezing, or open-mouth breathing in a dog
Sudden weakness, collapse, or pale gums
Excessive drooling or inability to swallow

NH emergency vets

Veterinary Emergency Center of Manchester
Manchester
(603) 666-6677
Port City Veterinary Referral Hospital
Portsmouth
(603) 433-0056

Common questions

Frequently asked

Anchor Pest Services

Yellowjackets gone — and they stay gone.

Same-day service across Southern New Hampshire. NH-licensed #782664. Family-owned since 2017. We handle ground, wall, and aerial nests with EPA-registered products and a 30-day re-treat guarantee.

Call for a Free Quote Call (603) 785-0118

NH License #782664Manchester, NH 03103Monday-Friday 8am-5pm

Yellow Jacket Sting Allergic Reaction — Anaphylaxis Signs, When to Call 911 & Venom Immunotherapy (NH)

If You're Seeing This After a Sting — What to Do First

Yellow Jacket Anaphylaxis Risk in Southern New Hampshire

Three reactions — local, large local, anaphylaxis

Local Reaction

Large Local Reaction

Systemic Reaction (Anaphylaxis)

How bad does a yellowjacket sting really hurt?

What happens hour-by-hour after a sting

Eight steps — the home protocol that actually works

Inject epinephrine FIRST — outer thigh

Call 911 SECOND

Position: flat with legs raised 12 inches

Give a second dose if no improvement in 5–15 min

Always go to the ER — even if symptoms resolve

See an allergist after the event for VIT evaluation

Red flags — call 911 immediately

New Hampshire emergency contacts

Northern New England Poison Center

Catholic Medical Center

Elliot Hospital

VA Manchester Healthcare System

Southern New Hampshire Medical Center

Concord Hospital

Venom immunotherapy — the only cure for sting allergy

What to do if your dog or cat is stung

Frequently asked

I had hives all over my body after a sting — was that anaphylaxis?

I was stung 10+ times — is that the same as an allergic reaction?

Can I be allergic to my first known yellow jacket sting?

Is yellow jacket sting allergy hereditary?

How many epinephrine auto-injectors should I carry?

Can I drive myself to the ER during an allergic reaction?

What does an epinephrine auto-injector cost without insurance?

How long does venom immunotherapy (VIT) last?

Can my child receive venom immunotherapy?

Will antihistamines or steroids prevent anaphylaxis?

Should I take Benadryl before going outdoors if I'm allergic?

My dog had hives and vomiting after a sting — is that an emergency?

Sources & further reading (12)

Related yellowjacket pages

Yellowjackets gone — and they stay gone.