Do Centipedes Bite? Are They Dangerous?

Yes, centipedes bite — though technically they sting, using a pair of modified front legs called forcipules to pierce skin and inject venom rather than true jaws. For most healthy adults in the United States, a bite produces localized pain, redness, and swelling comparable to a bee sting, resolving within hours to two days. Healthline places the total confirmed human fatalities from centipede bites at just 1–7 globally since 1932. For the vast majority of encounters, dangerous is not the right word.

Pain scales directly with species size. The house centipede (Scutigera coleoptrata) — the fast, gray, long-legged species most common indoors — often cannot pierce adult skin at all. The Texas redheaded centipede (Scolopendra heros), reaching up to 9 inches and widespread across Texas and the Southwest, delivers a substantially stronger bite: sharper pain, pronounced swelling, and occasionally nausea, headache, or dizziness.

A centipede bite leaves two small puncture marks arranged in a V-shape, created by the paired forcipules. The area reddens within minutes. That V-pattern is what distinguishes a centipede bite from a spider bite when you didn't see the culprit.

For immediate first aid: wash the bite site with soap and water, then apply an ice pack or a warm-water soak — centipede venom is heat-labile, and warm immersion actively helps neutralize it, according to Poison Control. Take ibuprofen or acetaminophen for pain. Go to the ER if you develop hives, facial swelling, chest tightness, or difficulty breathing — these signal anaphylaxis, rare but documented. Children, anyone with a bee or wasp sting allergy, and diabetics face elevated complication risk and warrant closer monitoring.

Centipede bites are almost always provoked. These animals do not pursue humans.

Bite vs. Sting: Why the Terminology Matters for Your Treatment

The "bite" in centipede bite is a misnomer — centipedes envenomate with forcipules, hollow claw-like appendages on the first body segment that connect directly to venom glands, not with mouthparts. This distinction has a concrete treatment implication: because the injected venom is heat-labile, warm-water immersion helps break it down in a way that ice alone does not. Poison Control recommends both approaches as complementary — ice for swelling, warm water to address the venom chemistry itself. The puncture wound also carries a tetanus risk; if your last booster was more than 10 years ago, mention it to a physician if symptoms linger beyond 48 hours.

House Centipede vs. Texas Redhead: Species Determines Severity

The species you encountered is the most important factor in assessing a bite. Here is a practical comparison for Texas and Southwest homeowners:

Texas Parks and Wildlife describes the Scolopendra heros bite as producing "a sharp, painful sting sometimes accompanied by swelling." Published case reports document rare but serious outcomes with this species, including rhabdomyolysis (muscle breakdown) and localized skin necrosis. If you found a large centipede with a red head and dark body inside your Texas home, treat the bite more seriously than you would a house centipede encounter — and keep an eye on symptoms for 48 hours.

What Does a Centipede Bite Look Like? Symptoms by Severity

The hallmark sign of a centipede bite is two puncture marks in a V-shape, surrounded by redness and swelling within the first 15–30 minutes. Mild bites — the large majority — produce a reaction indistinguishable from a bee sting: a small swollen area that fades within a few hours.

Moderate bites show expanding redness, more pronounced swelling, and warmth persisting for 24–48 hours. Severe local reactions can include blistering or skin discoloration at the bite site. Researchers have isolated more than 500 components from centipede venom, including histamine, serotonin, and cardio-depressant toxin-S — a chemical profile that explains the range from simple local pain to occasional systemic symptoms such as nausea or headache in individuals bitten by larger species, per Medical News Today.

When Is a Centipede Bite Medically Serious? A Risk Framework

Most centipede bites resolve at home without a physician visit — but the right answer depends on who was bitten and by what species:

• Healthy adult, house centipede: Home treatment is appropriate. Monitor for 24 hours; seek care only if swelling worsens.
• Healthy adult, large species (Scolopendra heros): Home treatment is appropriate if symptoms remain localized. See a doctor if pain or swelling worsens after 6 hours or has not improved within 48 hours.
• Child under 10, any species: Contact a physician. A smaller body mass receives a proportionally larger venom dose relative to weight.
• Known bee or wasp sting allergy: Treat as a potential anaphylaxis event. Use an epinephrine auto-injector if available and go to the ER regardless of initial symptom severity.
• Diabetic or immunocompromised: Higher risk of secondary infection at the puncture wound; antibiotic evaluation may be appropriate even for mild bites.

Anaphylaxis from centipede venom is rare but not theoretical. A 2024 PMC case report confirms centipede venoms contain large quantities of allergenic proteins capable of triggering systemic reactions, including hypotension and loss of consciousness. If hives, throat swelling, or low blood pressure appear within 30 minutes of a bite, call 911 immediately. The Poison Control hotline (1-800-222-1222) is available 24 hours a day for real-time guidance.

What Attracts Centipedes to Your Home — And What It Signals

A centipede inside your home is almost always following its food supply. As predatory arthropods in the class Chilopoda, house centipedes prey on cockroaches, silverfish, ants, and termites. Their presence indoors is a reliable indicator that one or more of those prey species is already established in sufficient numbers to sustain a predator.

Moisture is the second driver. Scutigera coleoptrata requires high humidity to survive; the UC ANR IPM Program confirms that house centipedes are the only centipede species capable of completing their entire lifecycle indoors, and that dehumidification is among the most effective control methods available. Basements, bathrooms, crawl spaces, and areas near plumbing leaks are primary harborage zones.

If you are seeing centipedes frequently, the more important question is what they are eating. A termite pest control technician can assess whether a termite population — one of the centipede's preferred prey — is the underlying attraction drawing them indoors.

How to Prevent Centipedes from Returning

Moisture control is the highest-leverage first step — not pesticide. The EPA's moisture guidance recommends keeping indoor humidity between 30–50%; above 50%, centipedes have the conditions they need to breed and survive. Run dehumidifiers in basements and crawl spaces, repair plumbing leaks, and run exhaust fans for at least 20 minutes after showers.

Beyond moisture: seal cracks in foundation walls and gaps around pipe penetrations, remove leaf litter and woodpiles within 3 feet of the foundation, and reduce clutter in crawl spaces where centipedes establish harborage. Eliminating the underlying prey population — the silverfish, cockroaches, and other insects centipedes hunt — removes the food source sustaining them far more effectively than targeting the centipedes themselves.

When centipedes persist despite moisture management, a concurrent insect infestation is almost certainly the driver. Consulting a bed bug pest control company or general pest management professional to eliminate the underlying prey population addresses the root cause rather than the symptom.

When Professional Help Becomes Necessary

Centipede management is often a DIY-solvable problem — but professional assessment is the right call when:

1. You are finding centipedes more than twice per week despite having addressed moisture and sealed visible entry points
2. You have identified Scolopendra heros — the large, red-headed Texas centipede — inside the home, particularly in areas where children or pets spend time
3. A bite has produced symptoms beyond local pain and swelling, such as nausea, headache, or any systemic reaction, and you want the underlying infestation evaluated
4. A prior inspection or visible evidence suggests an active cockroach, silverfish, termite, or bed bug population inside the structure sustaining centipede activity
5. Centipedes are appearing in a crawl space, wall void, or other area you cannot physically access to address moisture or sealing

If two or more of these conditions match your situation, a professional inspection identifies the prey ecosystem driving centipede activity — so treatment targets the cause, not just the visible pest.

Pest control companies in san antonio served by Eradyx can assess both the centipede presence and the underlying prey infestations sustaining it. For homeowners north of the city, an exterminator round rock tx can evaluate crawl space moisture and structural entry points in detail. For a broader picture of what professional treatment costs across the state, our guide covering the best rodent control company options and Texas pest control pricing provides useful context.

FAQ

Q: Do house centipedes bite humans?

A: Yes, but very rarely. House centipedes (Scutigera coleoptrata) instinctively flee rather than fight, and their forcipules are often too small to break adult skin. Most bites occur when a centipede is trapped against skin inside a shoe, clothing, or bedding and has no escape route. The bite, if it does occur, is typically mild and fades within a few hours.

Q: Are centipedes poisonous or venomous?

A: Venomous, not poisonous. Centipedes actively inject venom through their forcipules — they are not toxic if accidentally ingested. Their venom contains histamine, serotonin, and cardio-depressant toxin-S, but is not life-threatening to healthy adults in the doses delivered by species common in the United States.

Q: Can a centipede bite kill you?

A: Almost certainly not. Healthline cites only 1–7 confirmed human fatalities from centipede bites recorded globally across nearly a century. The greatest medical risk is anaphylaxis in susceptible individuals — documented in peer-reviewed case reports — but this remains rare. Individuals with known insect venom allergies should seek emergency evaluation after any bite.

Q: What is the difference between a centipede and a millipede bite?

A: Centipedes are venomous predators and will sting in self-defense; a bite produces pain and localized swelling. Millipedes do not bite. When threatened, millipedes curl into a spiral and may secrete a defensive fluid that can irritate skin, but they have no venom delivery mechanism and pose no bite risk to humans.

Q: How long does a centipede bite last?

A: Mild to moderate bites from small species typically resolve within a few hours. Bites from larger species like Scolopendra heros may cause symptoms lasting 24–48 hours. If redness, swelling, or pain is worsening rather than improving after 48 hours, consult a doctor to rule out secondary infection at the puncture site.

Quick Reference: Centipede Bites — Key Facts

• Centipedes sting using forcipules — modified front legs connected to venom glands — not true jaws; the venom is heat-labile, which is why warm-water immersion can help reduce symptoms alongside ice.
• Global confirmed fatalities from centipede bites total only 1–7 since 1932, making deadly outcomes extremely rare (Healthline).
• The house centipede (Scutigera coleoptrata) frequently cannot break adult skin; the Texas redhead (Scolopendra heros), at up to 9 inches, produces the most severe bites of any North American species and warrants closer symptom monitoring.
• The identifying mark of a centipede bite is two V-shaped puncture marks with immediate localized redness — this pattern distinguishes it from a spider bite when the insect was not seen.
• Anaphylaxis is documented but uncommon; anyone with a known bee or wasp venom allergy should treat a centipede bite as a potential allergic emergency and use an epinephrine auto-injector if available.
• Immediate home treatment is: soap and water wash, ice pack or warm-water soak, and OTC ibuprofen or acetaminophen; call 911 or go to the ER for hives, facial swelling, throat tightness, or difficulty breathing.
• Centipedes inside a home signal an established prey population — cockroaches, silverfish, ants, or termites — and eliminating that underlying infestation is more effective long-term than targeting centipedes directly.
• Professional inspection is warranted when sightings exceed twice per week despite moisture control, or when Scolopendra heros is found inside a home where children or pets are present.