ARE CENTIPEDES POISONOUS?

Yes, all centipedes are venomous, they have a pair of modified front legs called forcipules that inject venom into prey. But for most humans, a centipede bite is similar to a bee sting in severity, and only a few species are large enough to break human skin in the first place. The common house centipede you find in your bathroom is not dangerous. The Texas redheaded centipede is a different story, it's one of the largest centipedes in North America, and its bite is genuinely painful, though still not deadly for most adults.

This guide covers everything you need to know: the difference between centipedes and millipedes, the species you'll actually encounter in a Central Texas home, what a bite feels like, why centipedes keep appearing, and how to get rid of them, or whether you even should.

What's the Difference: Centipede vs Millipede?

Centipedes and millipedes are both myriapods, many-legged arthropods, but they're as different in biology and behavior as a wolf and a cow. The confusion is understandable because they look similar at a glance. Here's how to tell them apart in under ten seconds.

Look at the Legs

The most reliable ID method: centipedes have one pair of legs per body segment; millipedes have two pairs. In practice, centipede legs spread wide to the sides and the animal looks flat and fast. Millipede legs are tucked under a rounded, cylindrical body and the animal moves slowly in a rippling wave. If it's sprinting across your bathroom floor, it's a centipede. If it's slowly crawling along the baseboard, it's almost certainly a millipede.

Behavior and Diet

Centipedes are active predators. They hunt live insects, spiders, and other small arthropods, which is why they need venom. Millipedes are decomposers, they eat decaying organic matter, fungi, and plant material. A millipede in your house is not hunting anything; it wandered in from outside, usually after rain.

Defense Mechanisms

Centipedes bite, they inject venom through their forcipules (modified front legs that function like fangs). Millipedes don't bite at all. Instead, when threatened, a millipede curls into a tight coil and secretes a defensive chemical, a mild cyanide compound in some species, through pores along its body. The secretion can stain skin or irritate eyes and mucous membranes, but it's not dangerous to a healthy adult.

House Centipede (Scutigera coleoptrata)

The house centipede is almost certainly the one you've seen streaking across your bathroom floor at midnight. It's the centipede most people in Texas encounter indoors, and despite looking alarming, it's more helpful than harmful.

Appearance

• Body length: 1 to 1.5 inches, but 15 pairs of extremely long, banded legs make it appear much larger, sometimes 3–4 inches across
• Color: Yellowish-gray to tan with three dark longitudinal stripes running down the body
• Legs: The back legs of the female are nearly twice the length of the body, longer than any other pair, used to grab prey
• Antennae: Very long, almost as long as the body
• Movement: Extremely fast in short bursts, it can hit 1.3 feet per second when startled

What House Centipedes Eat

House centipedes eat cockroaches, silverfish, moths, flies, spiders, earwigs, small ants, and termites. They're ambush predators that use their long legs to encircle and grab prey. One house centipede can eat dozens of insects per night. If you have house centipedes, they are actively reducing your population of harder-to-control pests.

Are House Centipedes Venomous?

Yes, all centipedes are venomous, including house centipedes. But the house centipede's forcipules are generally too small and weak to break human skin. Even if one does manage to bite, the result is minor: localized pain, slight redness, and swelling that resolves within an hour or two. No documented human fatalities have ever been attributed to a house centipede bite.

Why They're Actually Beneficial

House centipedes are one of the few household pests that entomologists genuinely recommend leaving alone. They don't damage food, fabric, or structures. They don't breed in large numbers indoors. And they eat the insects that do cause problems. If you find one, the most rational response is to leave it or put it outside. The presence of house centipedes usually indicates a broader moisture or insect problem worth investigating, the centipede itself is a symptom, not the root cause.

Texas Centipede Species

Texas has several centipede species, but two matter most to homeowners: the house centipede described above, and the Texas redheaded centipede, a genuinely imposing animal that requires a different level of respect.

Texas Redheaded Centipede (Scolopendra heros)

The Texas redheaded centipede is one of the largest centipedes in North America. It's found throughout Central Texas, including Bastrop County, Lee County, and the Hill Country, and it is not something you want to handle bare-handed.

• Size: 6 to 8 inches long, with some specimens reaching close to 9 inches
• Color: Red or orange head, dark blue-green or black body segments, yellow legs, the coloring is distinctive and serves as a warning
• Habitat: Rocky areas, under logs, leaf litter, and rocky outcroppings, but it enters homes seeking moisture or prey
• Diet: Lizards, frogs, small snakes, mice, and large insects, this is not a small animal
• Venom: Powerful enough to cause significant pain, local swelling, and systemic symptoms in some people

How Common Are They?

Texas redheaded centipedes are not rare in Central Texas, they're just nocturnal and reclusive enough that most people never see one. They're more common in rural and semi-rural areas, particularly in rocky terrain. If you find one in your home, it almost certainly entered from outside rather than establishing a population indoors. Capture it with tongs or a jar (never bare hands) and release it well away from the house.

Other Texas Centipedes

Other centipede species found in Texas include the Scolopendra polymorpha (tiger centipede, tan and brown, up to 4 inches) and various smaller species in the Lithobius and Geophilus genera. None approach the Texas redheaded centipede in size or venom potency, and the house centipede remains the most common indoor species across the state.

Are House Centipedes Dangerous?

In the vast majority of cases, no. Here's the honest breakdown:

• They rarely bite humans, house centipedes flee rather than fight. Bites happen when the centipede is trapped against skin or directly handled.
• Their forcipules are usually too small to penetrate adult human skin effectively.
• Even successful bites are minor, localized pain and minor swelling, similar to a bee sting, resolving within a few hours.
• They cause no property damage, no wood-boring, no fabric damage, no food contamination.
• They actively reduce other pest populations in your home.

The exception is if you have a known venom allergy or experience a severe allergic reaction to a bite, swelling beyond the bite site, difficulty breathing, or symptoms that worsen rather than improve over several hours. In that case, treat it as you would any potential allergic reaction and seek medical attention.

Centipede Bite Symptoms & Treatment

What you actually experience depends heavily on the species. House centipede bites and Texas redheaded centipede bites are very different events.

House Centipede Bite

• Sharp, stinging pain at the site
• Minor redness and swelling
• Resolves within 1–3 hours in most people
• No medical treatment required for healthy adults

Texas Redheaded Centipede Bite

• Intense burning pain, often described as worse than a wasp sting
• Significant local swelling and redness that can spread several inches from the bite
• Possible nausea, headache, or dizziness
• Swollen lymph nodes near the bite site
• Symptoms typically peak within a few hours and resolve within 24–48 hours
• Rarely: severe allergic reactions requiring medical treatment

First Aid for a Centipede Bite

• Wash the bite site thoroughly with soap and water
• Apply a cold pack to reduce swelling
• Take an OTC pain reliever (ibuprofen or acetaminophen) for discomfort
• Apply hydrocortisone cream if itching is significant
• Watch for signs of allergic reaction over the next 30 minutes

When to Seek Medical Attention

Go to urgent care or an emergency room if you experience: difficulty breathing, swelling of the face or throat, rapid heartbeat, widespread hives or rash, severe nausea, or symptoms that rapidly worsen rather than plateau. These can indicate anaphylaxis, which is rare but possible with any venom exposure.

Why Centipedes Are in Your House

House centipedes don't move into homes by accident. They follow a specific set of conditions that your home either has or doesn't. Fixing these conditions is more effective at long-term centipede control than killing the centipedes you see.

Moisture

Centipedes require humid environments to survive, they lose water through their exoskeleton and will die in dry conditions. Homes with leaky pipes, poor ventilation, condensation issues, or damp crawl spaces create ideal conditions. Bathrooms, basements, and laundry rooms are the most common centipede hotspots because of persistent humidity.

Prey Insects

Centipedes are predators. If they're in your house, your house has enough other insects to feed them. Silverfish, cockroaches, and spiders are the most common prey that drive centipede populations indoors. If you're seeing house centipedes regularly, it's worth investigating whether you have a hidden silverfish or cockroach issue you're not aware of.

Dark Hiding Spots

Centipedes are strongly photophobic, they avoid light and seek darkness. Wall voids, the space behind baseboards, areas under sinks, and clutter in basements or garages provide exactly the dark, undisturbed habitat they need. Reducing clutter and improving storage organization removes the structural hiding spots that allow centipede populations to persist.

Are Millipedes Poisonous Too?

Millipedes are not poisonous in the traditional sense, they don't inject venom and they don't bite. Their defense mechanism is completely different from a centipede's. When threatened, a millipede curls into a tight coil and secretes defensive chemicals through pores along its body segments.

These secretions contain hydrogen cyanide, benzoquinones, or other mild irritants depending on the species. The practical effects on a human who handles a millipede:

• Skin staining (yellowish or brownish discoloration)
• Mild burning or itching if the secretion contacts sensitive skin
• Eye irritation if hands aren't washed before touching the face
• No systemic toxicity in healthy adults

Wash your hands after handling a millipede and avoid touching your eyes. That's the extent of precautions needed. Millipedes that wander indoors in Texas are harmless nuisances, they typically entered after heavy rain saturated the soil outside, and they'll die indoors within a day or two without their natural food sources.

What Do Centipedes Eat?

Centipedes are obligate carnivores. Every species eats live prey, they have no interest in your food, your wood, your fabric, or your plants. What they eat determines whether having them around is a feature or a problem.

House centipedes eat:

• Cockroaches, including German cockroaches, the hardest species to control
• Silverfish, a common companion pest in humid homes
• Spiders, including potentially venomous species like brown recluses
• Ants, particularly the foraging workers entering the home
• Flies and moths, captured mid-flight using their long legs
• Termites, individual workers encountered during night hunting
• Earwigs and small beetles

The Texas redheaded centipede operates at a different scale, it's large enough to take lizards, small snakes, frogs, and mice in addition to large insects. It keeps outdoor pest populations in check in a meaningful way, even if its indoor presence is unwelcome.

How to Get Rid of Centipedes (and Whether You Should)

Before treating for centipedes, decide whether treatment is actually necessary. A single house centipede spotted occasionally is not a problem worth using pesticides for. Frequent sightings, multiple per week, or centipedes in living areas rather than just bathrooms, suggest a population large enough to justify action.

Fix Moisture First

• Fix any leaking pipes, even minor drips
• Use a dehumidifier in basements or crawl spaces that run above 50% relative humidity
• Improve bathroom ventilation, run exhaust fans during and after showers
• Make sure gutters drain water away from the foundation
• Seal any gaps where pipes enter walls, which also let humid air in

Seal Entry Points

• Seal gaps around pipes, conduit, and electrical entries with caulk or expanding foam
• Install door sweeps on exterior doors, especially garage doors
• Check foundation cracks and seal anything larger than 1/16 inch
• Replace damaged window screens and weatherstripping

Reduce the Prey Population

This is the most important long-term strategy. If you eliminate the insects that centipedes eat, centipedes lose their reason to be indoors. A professional general pest control treatment that targets cockroaches, silverfish, and spiders will starve out the centipede population more effectively than targeting centipedes directly.

Reduce Outdoor Harborage Near the Home

• Move firewood stacks away from the house, they're prime centipede habitat
• Remove leaf litter, mulch, and debris within 12 inches of the foundation
• Keep grass cut and trim vegetation back from the house perimeter

When to Call a Professional

Call a pest control professional when: you're seeing centipedes regularly in living spaces (not just bathrooms), you've identified a Texas redheaded centipede indoors, you've taken the moisture and exclusion steps above without improvement, or you want to treat the broader pest ecosystem rather than just the centipedes.

Cowboy Pest Eliminators handles centipede and general pest control across Central Texas as part of our general pest control service. We treat the full pest ecosystem, not just the visible centipedes, so the problem actually goes away rather than cycling back in a few weeks. Free inspections, honest assessment of what you actually have, and no upselling.

Common Questions

Are house centipedes dangerous?

No, not in any meaningful way for most people. House centipedes are venomous, but their forcipules are typically too small and weak to break human skin. The rare bite produces a reaction similar to a minor bee sting, localized pain and redness that resolves within a few hours. They cause no property damage and actively prey on pests you don't want.

Will a centipede bite you?

House centipedes prefer to flee rather than fight. Bites happen when the centipede is trapped against skin, directly handled, or cornered with no escape route. Don't try to pick one up bare-handed and you're almost certainly safe. The Texas redheaded centipede is more aggressive and more capable of delivering a painful bite, give it space and don't handle it.

What does a centipede bite feel like?

A house centipede bite feels like a bee sting, sharp, burning pain at the site followed by redness and mild swelling. A Texas redheaded centipede bite is significantly more painful, with intense burning, pronounced local swelling, and possible systemic symptoms like nausea and headache. Symptoms from both typically peak within a few hours.

Are centipedes good or bad to have around?

House centipedes are genuinely beneficial, they eat cockroaches, silverfish, spiders, and ants. The pest control community largely agrees that tolerating house centipedes is rational, especially in older homes with persistent pest pressure. That said, frequent centipede sightings signal a moisture or prey insect problem worth addressing at the root cause.

Do centipedes come out in the daytime?

Centipedes are nocturnal. During the day they hide in dark, humid spots, under sinks, in wall voids, in bathrooms, under clutter in basements. Seeing one in daylight usually means it's been disturbed from its hiding spot or the population is large enough that individuals are being pushed out of preferred dark areas.

How big do centipedes get in Texas?

The house centipede body is 1 to 1.5 inches, though its long legs can make it appear 3–4 inches across. The Texas redheaded centipede (Scolopendra heros) can reach 6 to 8 inches in body length, it's one of the largest centipedes in North America. If you find a centipede in your Central Texas home that's more than a couple inches long, it's very likely a redheaded centipede.

Are millipedes the same as centipedes?

No. Centipedes have one pair of legs per body segment, are predators, and can bite with venom-injecting forcipules. Millipedes have two pairs of legs per body segment, are decomposers that eat plant matter, and don't bite, they defend themselves with mild chemical secretions. The quick visual test: legs spread wide to the sides (centipede) vs. legs tucked under a rounded body (millipede).

Should I kill house centipedes?

You don't have to. House centipedes eat the insects you actually have a problem with, cockroaches, silverfish, and spiders. If you find one, the most useful responses are: leave it alone, or release it outside. If centipedes are appearing frequently, that's a signal to investigate moisture issues and the broader pest ecosystem in your home, not to wage war on the centipedes themselves.