Which Centipedes Are Poisonous to Humans?

Almost all centipedes produce venom, but the species that pose a real medical threat to humans belong overwhelmingly to one genus: Scolopendra. These are the large, fast-moving tropical and subtropical centipedes that can reach 20 centimeters or more in length. Out of roughly 3,000 known centipede species worldwide, only about 0.43 percent are considered potentially clinically significant, and Scolopendra species account for the majority of that small fraction.¹ The rest, including the common house centipede you might spot on a basement wall, can technically bite but rarely cause anything more than a mild sting.

Venomous, Not Poisonous

Before getting into which species matter, it helps to clear up the terminology. Centipedes are venomous, not poisonous. A poisonous animal harms you when you eat or touch it; a venomous one injects a toxin into you. Centipedes deliver venom through a pair of modified front legs called forcipules, which function like fangs. These curve forward beneath the head and pierce skin to inject venom from glands that run along their length. No centipede species is known to be harmful if swallowed (not that anyone should test this), so the word “poisonous” in the common sense doesn’t apply.

The Scolopendra Species That Matter Most

If you live in or travel to warm climates and want to know which centipedes deserve genuine caution, a handful of Scolopendra species come up repeatedly in the medical literature.

Scolopendra subspinipes, commonly called the Vietnamese or Asian giant centipede, is one of the most widespread and frequently encountered. It’s found across Southeast Asia, the Pacific Islands, and parts of the Caribbean and Central America. In Hawai’i, it is the only clinically significant centipede species, and envenomation typically causes intense localized pain, redness, hardening of the tissue around the bite, and sometimes tissue death or inflammation of the lymph vessels.² This species also features prominently in venom research; laboratory studies showed that a roughly three-gram specimen could kill a mouse fifteen times its weight within 30 seconds, thanks to a peptide toxin that blocks potassium channels across multiple organ systems simultaneously.³

Scolopendra heros, the Texas redheaded centipede, is the largest centipede in North America and ranges across the southern United States and into Mexico. Most bites produce temporary pain and redness that resolve on their own, but case reports describe complications including skin-tissue death, inflammation of the lymph vessels, and in rare instances rhabdomyolysis, a breakdown of muscle tissue that can damage the kidneys.⁴

Scolopendra cingulata is the Mediterranean species most often cited in European clinical literature. It tends to be somewhat smaller than its tropical relatives but still produces medically notable bites. Medical reviews list both S. subspinipes and S. cingulata among the most dangerous species worldwide.⁵

What About House Centipedes and Smaller Species

The long-legged house centipede (Scutigera coleoptrata) that people frequently encounter indoors belongs to an entirely different order of centipedes, the Scutigeromorpha. These animals do produce venom, but their forcipules are weaker and less adapted for piercing human skin. Research comparing the two groups found that house centipede relatives rely heavily on venom for catching prey but lack the physical adaptations that allow Scolopendra species to inflict mechanical damage.⁶ In practical terms, a house centipede bite is unlikely to break your skin, and if it does, the result resembles a mild bee sting at worst. Smaller soil-dwelling centipedes in the orders Lithobiomorpha and Geophilomorpha are similarly too small to cause harm to people, even though they are technically venomous.

What a Scolopendra Bite Actually Feels Like

Pain is the dominant symptom, and people who have been bitten consistently describe it as disproportionately intense. The venom’s peptide toxins evolved to target voltage-gated ion channels in the nervous system, which is the biological machinery responsible for transmitting pain and other nerve signals.⁷ That means the venom is essentially purpose-built to cause as much pain as possible with as little material as possible.

The typical bite leaves two visible puncture marks at the site, followed within minutes by redness in a circular area usually less than five centimeters across, along with swelling, itching, and a burning sensation.⁵ Most people describe the pain as peaking within the first hour and gradually subsiding over twelve to 36 hours. In a clinical context, pain is consistently noted as the most prominent symptom requiring management.⁸

Rare but Serious Complications

Deaths from centipede bites are extremely uncommon, and when they do occur they tend to result from secondary infection or severe allergic reaction rather than the venom itself.² That said, the medical literature documents a small number of genuinely alarming outcomes. These fall into a few categories.

Cardiac events are the most dramatic. A case report described a 20-year-old man who arrived at an emergency department after a centipede bite with chest pain, abnormal heart-rhythm tracings, and elevated cardiac enzymes consistent with a heart attack.⁹ Another case involved a 31-year-old man who suffered a heart attack and cardiac arrest after a bite from a large centipede, representing one of only a handful of such cases in the English-language medical literature.¹⁰ These events appear to involve venom-induced spasm of the coronary arteries or direct toxic effects on the heart muscle.

Other severe complications that show up in case reports include rhabdomyolysis, compartment syndrome (dangerous pressure buildup in a limb), kidney-related protein loss, and fainting episodes. All of these are categorized as extremely rare.⁵

Allergic Reactions and Anaphylaxis

Perhaps a more realistic danger than the venom itself, at least for repeat exposures, is allergy. Centipede venoms contain substantial amounts of allergenic proteins, and some people develop true immune-mediated reactions to them.¹¹ One published case described systemic anaphylaxis presenting as sudden severe abdominal pain immediately after a bite, which resolved only after an epinephrine injection.

A pediatric case further illustrated the challenge of distinguishing a toxic reaction from an allergic one. A child bitten by a centipede developed widespread hives at body sites far from the bite, along with breathing difficulty, all within about ten minutes. Clinicians noted that the rapid onset and the spread of symptoms to distant skin sites pointed toward an immune-mediated mechanism rather than simple venom toxicity.¹² True IgE-mediated centipede allergy has been confirmed in only a limited number of adults using specialized testing, so it remains poorly understood. For anyone who has had a previous bite with an unusually strong reaction, carrying an epinephrine auto-injector in centipede-prone areas is reasonable to discuss with a doctor.

Infection Risk From the Bite Wound

Beyond venom toxicity and allergy, a centipede bite is also a puncture wound, and puncture wounds invite bacteria. Researchers recently conducted the first study characterizing the bacterial communities living on and inside centipede forcipules and found that some of the species identified had been previously isolated from infected centipede bite wounds in clinical reports.¹³ The overall risk of infection appeared low, but the diversity of bacterial species present underscored the importance of thorough wound cleaning after any bite. This aligns with clinical guidance that considers wound care a standard part of post-bite management.

First Aid and Treatment

There is no antivenom for centipede bites. Treatment is supportive, meaning you manage the symptoms rather than neutralizing the toxin directly. A Taiwanese study comparing three common approaches found that ice packs, hot-water immersion, and injectable painkillers all reduced pain effectively. Ice packs in particular were highlighted as a safe, cheap, and non-invasive first-line option for pre-hospital management.¹⁴

Beyond ice, standard care includes cleaning the wound thoroughly, applying topical or oral antihistamines for swelling and itching, and using anti-inflammatory medications for pain. If the pain is severe enough to send someone to an emergency department, physicians may use regional nerve blocks or stronger painkillers. Most bites resolve with conservative care and do not require hospitalization. A study from the French Caribbean found that hospital admission was more frequent among adults and patients with diabetes, while bites in children were mostly benign.¹⁵

Signs that warrant medical attention include worsening redness or red streaks spreading from the bite (suggesting cellulitis or lymphangitis), difficulty breathing, chest pain, widespread hives, or symptoms that worsen rather than improve after several hours.

When and Where Bites Happen

Centipede bites follow a seasonal pattern tied to warm, rainy weather. A ten-year retrospective study at a Bangkok hospital found that envenomations peaked from October through December, coinciding with the tail end of Thailand’s monsoon season.¹⁶ A Brazilian study covering nearly a decade of cases in São Paulo found a similar pattern, with about 61 percent of stings occurring during the warm-rainy season, and roughly 68 percent happening inside patients’ homes.¹⁷ The pattern makes sense: heavy rains flush centipedes out of the soil and leaf litter where they normally live, driving them into houses and shoes and bedding.

The nocturnal habits of most large centipedes also mean that many bites happen at night or in the early morning. People get bitten while sleeping, putting on shoes, or reaching into dark spaces. In tropical regions where centipedes are common, shaking out shoes and bedding before use is standard advice. One case report describes a centipede that entered a woman’s ear canal while she slept, requiring careful removal in a clinical setting.¹⁸

How Centipede Venom Works at the Molecular Level

Centipede venom is far more complex than researchers initially expected. Transcriptome analyses of venom glands have identified more than 500 distinct peptide sequences, though only a small fraction have been functionally characterized so far.¹⁹ The main active ingredients are small, tightly folded peptide toxins reinforced by chemical bonds that make them unusually stable against heat and biological breakdown. These peptides evolved to disrupt prey by targeting ion channels, the molecular gates that nerve and muscle cells use to generate electrical signals.

Evolutionary analysis suggests that the earliest centipede venoms were relatively simple cocktails containing just a few enzymes and toxins. Over hundreds of millions of years, Scolopendra and its relatives evolved larger, more complex venom glands capable of producing a much wider arsenal of toxins. Researchers used imaging techniques to show that different cell clusters within a single venom gland produce different toxins, essentially creating a factory with specialized production lines.⁶ Ancestral venom reconstruction suggests the original cocktail contained a pore-forming toxin, an enzyme for breaking down tissue, and a protein that inhibited calcium channels, all working together to immobilize prey and begin digesting it.²⁰

Centipede Venom as a Source for New Painkillers

Ironically, the same venom that causes such intense pain contains components that could lead to powerful new pain medications. One research team isolated a 46-amino-acid peptide from Scolopendra subspinipes mutilans venom that selectively blocks a specific sodium channel called NaV1.7, which is a key gateway for pain signaling in humans. In rodent models, this peptide outperformed morphine as a painkiller while targeting a much more specific molecular pathway.²¹ People born with non-functional NaV1.7 channels are known to be congenitally unable to feel pain, which is why this channel is considered one of the most promising drug targets in pain research. The centipede-derived peptide remains a lead compound, not a drug you can get prescribed, but it represents an active line of pharmaceutical research.

The same study that demonstrated how S. subspinipes venom kills mice through KCNQ potassium channel blockade also identified a potential countermeasure: retigabine, a drug that opens those same channels, neutralized the lethal effects of the venom in laboratory settings.³ While this hasn’t been tested as a clinical treatment for human bites, it illustrates how studying the venom’s mechanism can point toward specific therapeutic interventions rather than just general supportive care.