House centipedes and “regular” centipedes belong to the same class of arthropods, but they look, behave, and live so differently that most people assume they’re unrelated. The house centipede is a specific species with long, spindly legs and a preference for indoor life. Other centipedes, particularly the larger outdoor species, are stockier, slower, and far more likely to deliver a painful sting. Here’s how they compare across every category that matters.
How They Look
The easiest way to tell them apart is by their legs. House centipedes have 15 pairs of extraordinarily long, delicate legs that fan out from the body. On adult females, the last pair stretches to nearly twice the body length, giving the whole animal an appearance of three to four inches even though the actual body is only one to one and a half inches long. The legs are banded light and dark, and the body is a dirty yellow with three dark stripes running lengthwise. The overall effect is something like a small, fast-moving tangle of thread.
Other common centipedes, especially the larger tropical and garden species, look completely different. Their legs are short relative to their body, tucked close to the sides, making them appear worm-like or segmented. Some of the largest species reach 6 to 8 inches in body length alone. Their coloring ranges from reddish-brown to dark olive or black, and their bodies are noticeably flattened. Where a house centipede looks fragile and spidery, an outdoor centipede looks armored and muscular.
Where Each One Lives
House centipedes are one of the few centipede species that thrive indoors. They gravitate toward damp, dark spaces: basements, bathrooms, crawl spaces, closets, and anywhere with high humidity. They’re nocturnal hunters that spend daylight hours hiding behind baseboards or in floor drains, then come out at night to hunt. If you’re seeing them regularly, it almost always signals a moisture issue in your home.
Most other centipedes are outdoor creatures. Garden centipedes (sometimes called stone centipedes) live under rocks, leaf litter, and rotting logs. Soil-dwelling centipedes burrow underground and are rarely seen at all. The larger tropical species shelter beneath bark and stones in warm, humid environments. These centipedes occasionally wander indoors by accident but don’t establish populations inside homes the way house centipedes do.
Speed and Behavior
House centipedes are remarkably fast. Those long legs let them sprint across walls, ceilings, and floors at speeds that startle most people. They can stop and change direction almost instantly, which is part of what makes them such effective hunters. They actively chase down prey rather than ambushing it.
Outdoor centipedes are generally slower and more methodical. Garden centipedes move at a steady crawl, and soil-dwelling species burrow rather than run. The larger species are strong and deliberate, using their size and powerful venom to overpower prey rather than outrunning it. You’re unlikely to see one dart across your bathroom wall at midnight.
What They Eat
This is where house centipedes earn their reputation as beneficial roommates. They’re aggressive predators of cockroaches, silverfish, spiders, carpet beetle larvae, ants, and other household pests. A house centipede actively patrols your home at night, hunting the insects you’d rather not have around. The University of Georgia’s agricultural extension program describes them plainly as “allies in home pest control.”
Outdoor centipedes eat a similar diet of invertebrates, scaled to their size. Garden centipedes consume slugs, worms, and small insects. The largest tropical species can take down mice, small lizards, and even bats. Their role in the ecosystem is the same (top predator of the invertebrate world), but the setting and scale differ dramatically.
Venom and Bite Risk
All centipedes are venomous. They deliver venom not through a true bite but through forcipules, which are modified front legs that work like pincers to pierce skin and inject toxin. That said, the practical risk varies enormously between species.
House centipedes are classified as “fast but delicate.” Their forcipules are small and often struggle to penetrate human skin at all. When they do manage to sting, the result is typically comparable to a mild bee sting: brief, localized pain that resolves on its own. They rarely sting unless physically trapped against the body.
Large outdoor centipedes are a different story. The biggest tropical species carry venom that’s a lipid-toxin complex similar in structure to scorpion venom. It contains compounds that trigger inflammation, affect smooth muscle, and can temporarily depress cardiovascular function. A sting from one of these species causes intense, burning pain that can last hours, along with significant swelling and redness. Serious systemic reactions are rare (it would take the venom from roughly 1,000 venom glands to be fatal in an adult), but the local pain is severe enough to send people to urgent care.
If You Get Stung
For a house centipede sting, basic first aid is usually all you need. Wash the area with soap and water, then apply a cold compress for about 15 minutes at a time to ease pain and swelling. Don’t place ice directly on the skin; wrap it in a towel first. Watch the site over the next day or two for signs of infection like increasing redness, warmth, or drainage.
For a sting from a larger centipede, the same first-aid steps apply, but you should pay closer attention to your body’s response. Allergic reactions, while uncommon, can include hives, dizziness, or swelling of the lips, tongue, or throat. Difficulty breathing or throat swelling after any centipede sting is a medical emergency.
Life Cycle Differences
House centipedes develop slowly compared to most household arthropods. A newly hatched house centipede starts life with just four pairs of legs. It then passes through five larval molts, gaining legs at each stage: 5, 7, 9, 11, and 13 pairs in succession. After one more molt it reaches 15 pairs and enters an adolescent phase of four additional molts before becoming a full adult. This extended development means house centipedes can live for several years, which is unusually long for a small indoor arthropod.
Outdoor centipede species vary widely. Smaller garden centipedes may complete their life cycle in a year or two. The larger tropical species can live five to seven years or more, growing slowly and molting repeatedly throughout their lives.
Managing House Centipedes Indoors
Because house centipedes depend on moisture, the single most effective control measure is reducing humidity. Running a dehumidifier in your basement or crawl space makes the environment inhospitable to them. Fixing leaky pipes, improving ventilation in bathrooms, and sealing cracks around foundations also help by removing both the moisture they need and the entry points they use.
Reducing their prey eliminates the food source that supports an indoor population. If you address a cockroach or silverfish problem, the house centipedes lose their reason to stay. Chemical treatments are rarely necessary.
If you simply can’t coexist with them, the humane approach is to trap one under a glass, slide a piece of cardboard underneath, and release it outside. But it’s worth knowing that a house centipede in your bathroom is actively reducing the population of less welcome pests. Many entomologists consider them one of the most beneficial arthropods that share our living spaces.