What Centipedes Are Poisonous to Humans?

All centipedes are venomous, but only a small fraction pose real medical concern. Roughly 0.43% of the more than 3,000 known centipede species are considered clinically important, and nearly all of them belong to the genus Scolopendra, the giant centipedes found across tropical and subtropical regions worldwide.¹ The vast majority of centipede encounters produce nothing worse than temporary pain and swelling, but the exceptions, while rare, can be genuinely serious. Understanding which species matter, what their venom actually does, and when to seek medical help turns a vague fear of crawling things into practical knowledge.

Venomous, Not Poisonous

The distinction matters more than it might seem. Poisonous animals hurt you when you eat or touch them. Venomous animals inject toxins into you through a bite, sting, or specialized structure. Centipedes fall squarely in the venomous category. Every centipede species has a pair of modified front legs called forcipules, which are essentially hollow, fang-like claws connected to venom glands. These structures evolved from walking legs more than 400 million years ago and are unique to centipedes; no other group of animals weaponized a pair of legs this way.² The forcipules pierce the skin and squeeze venom into the wound, a delivery system that works well on insects and small prey but can also penetrate human skin when the centipede is large enough.

Small house centipedes, the leggy, fast-moving kind that dash across bathroom walls, technically have venom too, but their forcipules are generally too small and weak to break through human skin. When people ask which centipedes are “poisonous,” they almost always mean: which ones can hurt me? The answer centers on one group of centipedes and a handful of species within it.

The Scolopendra Species That Actually Matter

The genus Scolopendra contains the centipedes most likely to cause meaningful symptoms in humans. These are large animals, often 10 to 20 centimeters long and sometimes exceeding 25 centimeters, with robust forcipules capable of delivering a painful bite. Several species stand out in the medical literature.

Scolopendra subspinipes, the Vietnamese or Chinese red-headed centipede, is probably the most widely studied and one of the most frequently encountered worldwide. It thrives across Southeast Asia, the Pacific islands, and parts of Central and South America. Research into its venom has identified a major allergen, Sco m 5, that triggers an immune response in a high percentage of centipede-allergic patients and even shows cross-reactivity with wasp venom, meaning people allergic to certain wasps may also react to this centipede’s bite.³

Scolopendra heros, the giant desert centipede or Texas redheaded centipede, is North America’s largest centipede, reaching around 20 centimeters. It ranges from the southwestern United States into Mexico. Case reports document complications including lymphangitis, cellulitis, necrosis, and even rhabdomyolysis following its bite.⁴ One published case described acute kidney failure triggered by rhabdomyolysis after a S. heros bite.⁵

Scolopendra morsitans and Scolopendra hardwickei coexist in tropical Asia, and recent research has shown their venoms differ substantially despite the species being closely related. Their venom profiles are cocktails of enzymes, pore-forming toxins, and neurotoxins, but the specific protein repertoires are quite distinct between the two.⁶ That finding is a reminder that even within the same genus, you cannot assume one species’ bite will behave like another’s.

Scolopendra viridicornis, found in South America, produces bites characterized by burning pain, numbness, and swelling. Research on this species has linked the swelling specifically to the release of histamine from mast cells, which is essentially the same inflammatory reaction behind allergic hives.⁷

What a Bite Typically Feels Like

Most centipede bites are unpleasant but manageable. The immediate sensation is sharp, stinging pain at the bite site, which then often develops swelling, redness, and sometimes numbness or tingling in the surrounding area. A Sri Lankan study of arthropod stings and bites at primary hospitals found that pain, swelling, and anaphylactic reactions were the most common adverse effects across all arthropod encounters, centipede bites included.⁸ For the typical centipede bite, the pain peaks within the first hour or two and fades over several hours, sometimes lingering for a day or two.

The more common symptom profile includes localized pain, paresthesia (that tingling or “pins and needles” sensation), headache, dizziness, nausea, and occasionally mild lethargy.¹ These symptoms resolve on their own in most cases without any specific medical treatment. The bite marks themselves are distinctive: two small puncture wounds close together, matching the paired forcipules.

Why the Pain Is So Intense

Centipede venom is remarkably complex. Transcriptome studies have identified more than 500 peptide sequences in centipede venom glands, though only a small number have been functionally described so far.⁹ Among those that have been characterized, a toxin called RhTx from the Chinese red-headed centipede stands out. This 27-amino-acid peptide directly activates TRPV1, the same receptor your body uses to sense burning heat. By hijacking the heat-sensing machinery, RhTx essentially tricks your nervous system into perceiving searing, burning pain at normal body temperature.¹⁰

A related peptide from the same species, RhTx2, also activates TRPV1 but then rapidly desensitizes the channel, essentially shutting it down after initial activation.¹¹ That activation-then-shutdown pattern may partly explain why centipede bite pain is often described as initially excruciating but then relatively short-lived compared to, say, a stonefish sting. The venom’s complexity goes far beyond pain, though. Those cocktails of enzymes, pore-forming toxins, and neurotoxins serve a primary purpose of subduing prey, and the painful side effects on humans are largely incidental.

Rare but Real Complications

The medical literature makes clear that severe outcomes from centipede bites are uncommon. But uncommon does not mean nonexistent, and some of the documented cases are striking. A review of centipede envenomation reported that very rare complications include myocardial ischemia and infarction, blood in the urine, muscle breakdown (rhabdomyolysis), hemorrhage, and anaphylaxis.¹

Heart complications are among the most alarming. One case described a 22-year-old man who suffered a full heart attack after a centipede bite. He had typical chest pain, abnormal heart rhythms, and elevated cardiac enzymes, yet his coronary arteries were completely normal on imaging, suggesting the venom itself triggered coronary artery spasm rather than a blockage.¹² In another reported case, a Scolopendra heros bite caused lymphangitis severe enough to require emergency department treatment in an elderly patient.⁴

Children and older adults appear to be at greater risk for complications, partly because of smaller body mass in children and pre-existing health conditions in the elderly. A case report described an 11-year-old girl whose centipede bite led to platelet abnormalities, an unexpected hematological complication.¹³ The bottom line on severe complications is that they are genuinely rare, but their potential severity means any centipede bite accompanied by symptoms beyond local pain and swelling warrants a trip to a healthcare provider.

Anaphylaxis and Allergic Reactions

Centipede venom contains substantial amounts of allergenic proteins, and for people who are sensitized, a bite can trigger anaphylaxis just as a bee or wasp sting can. One case report explicitly compared centipede-bite anaphylaxis to bee-sting anaphylaxis in severity, confirming through laboratory testing that the reaction was mediated by the same immune pathway (IgE antibodies).¹⁴

Reported anaphylactic reactions have included abdominal pain immediately after the bite, which resolved following adrenaline (epinephrine) administration.¹⁵ The cross-reactivity between centipede venom allergens and wasp venom is particularly worth knowing about. Research on the allergen Sco m 5 from Scolopendra subspinipes found that people with antibodies to this centipede allergen also reacted to venom from the Asian giant hornet.³ If you have a known allergy to wasp or hornet stings and live in an area with large centipedes, that cross-reactivity is something to discuss with an allergist. People who have already had one allergic reaction to a centipede bite are at elevated risk for anaphylaxis from a subsequent bite.

Where, When, and How Bites Happen

Centipede bites are not random events. They follow predictable patterns. A ten-year study at a Bangkok hospital found that feet were the most commonly bitten body part at about 38% of cases, followed by hands at about 19%. Bites peaked between October and December, aligning with the warm rainy season when centipedes are most active.¹⁶

An Australian study of centipede bites found a similar pattern: 13 out of 14 bites occurred on the hands or feet. About 57% of bites happened indoors, and half occurred at night.¹⁷ The typical scenario is someone stepping on a centipede in bare feet, reaching into a dark space where a centipede is hiding, or being bitten in bed when a centipede crawls under the covers. The S. heros case mentioned earlier involved an elderly man bitten while sleeping.⁴

Prevention is mostly common sense in areas where large centipedes are present. Shake out shoes before putting them on. Wear gloves when moving firewood, rocks, or garden debris. Check bedding if you sleep with windows open in tropical or subtropical regions. Seal gaps around doors and foundations. Centipedes are not aggressive toward humans; virtually every bite happens because the animal was surprised, trapped, or pressed against skin.

Treatment After a Bite

No antivenom exists for centipede bites, and treatment is supportive. A clinical comparison of three approaches (ice packs, hot water immersion, and injected painkillers) found that all three reduced pain by a similar amount, with no statistically significant difference between them. Ice packs were highlighted as a safe, inexpensive, and non-invasive first option.¹⁸ Washing the bite site with soap and water, applying an ice pack, and taking over-the-counter pain relievers is a reasonable approach for a bite that produces only local symptoms.

You should seek medical care if the pain is severe and not improving after a couple of hours, if swelling spreads significantly beyond the bite area, if you develop symptoms like chest pain, difficulty breathing, widespread hives, abdominal pain, muscle pain away from the bite site, or dark-colored urine. The chest pain and dark urine are potential signs of the cardiac and rhabdomyolysis complications described earlier, and they need prompt evaluation. Anyone with a known history of severe allergic reactions to insect or arthropod stings should treat a centipede bite with the same urgency they would a bee sting.

Centipede Venom in Traditional Medicine Gone Wrong

In parts of Asia, centipedes have a long history of use in traditional medicine, sometimes consumed dried, powdered, or soaked in alcohol. The medical literature includes cautionary cases. One report described a 49-year-old man who developed rhabdomyolysis, acute kidney failure, widespread nerve damage in both arms, and severe skin blistering after drinking alcohol that had been soaked with a centipede.¹⁹ In this context, the venom proteins, although partially denatured by alcohol, can still cause significant harm when consumed in concentrated form. The irony of using a venomous animal for medicinal purposes and triggering the very complications its bite can cause in severe cases is not lost on toxicologists.

Why Larger Centipedes Have More Complex Venom

Not all centipede venom is created equal, and the differences are tied to anatomy as much as ecology. Research comparing the venom systems of different centipede lineages found that scolopendrid centipedes (the large, ground-dwelling group that includes all the medically relevant species) have substantially more complex venom than scutigeromorph centipedes (the long-legged house centipedes). The difference is partly physical: scolopendrid venom glands can accommodate far more secretory cells, and those cells do not all produce the same toxins. Toxin production is heterogeneous across the gland, meaning different regions of the same gland make different components.²⁰ Scolopendrid forcipules are also built to inflict physical damage, functioning as both a venom delivery system and a weapon for gripping and crushing prey. House centipedes, by contrast, rely more heavily on venom alone because their delicate forcipules cannot physically overpower prey the way a giant centipede’s can.

This is part of why house centipedes are essentially harmless to humans. Even when they do manage to bite, their venom is simpler and delivered in far smaller quantities through weaker apparatus. The species that land people in emergency rooms are universally the big scolopendrids with their muscular, piercing forcipules and their pharmacologically rich venom cocktails.

Centipede Venom as a Source of Future Painkillers

The same properties that make centipede venom painful also make it scientifically valuable. Researchers interested in developing new pain medications have found that centipede venoms are rich in peptides targeting neuronal ion channels and receptors, and many of these peptides have pharmacological properties that are unexpected and potentially useful.²¹

The most striking finding so far involves a peptide isolated from the venom of Scolopendra subspinipes mutilans that selectively blocks a specific sodium channel, NaV1.7, which plays a central role in human pain perception. People born with non-functional NaV1.7 channels feel no pain at all. The centipede-derived peptide blocked this channel at very low concentrations and, in rodent testing, proved to be a more potent painkiller than morphine for chemically induced pain, matching morphine’s effectiveness for heat-based and acid-based pain.²² The selectivity is the key advantage: unlike morphine and other opioids, a NaV1.7-targeting drug could theoretically relieve pain without the addiction risk, respiratory depression, and other side effects that make opioids so problematic.

This work is still in early stages and confined to animal models, so a centipede-derived painkiller at your pharmacy is years away at best. But the research underscores a broader pattern in toxinology: venomous animals that cause pain often hold molecular keys to treating it.²³ With more than 500 venom peptides identified and only a handful studied in detail, centipede venom remains a largely untapped resource for drug discovery.