A glimpse of a house centipede (Scutigera coleoptrata),with its many legs and swift movement, can be alarming. But are house centipedes truly harmful? Here’s a quick look at what you need to know about these creepy yet often misunderstood arthropods.
Before we look at whether house centipedes are dangerous, let’s make sure that we’re dealing with the right pest. First, we’ll take a look at what they look like and then examine the house centipede life cycle and where you might find them.
House centipedes are yellowish-grey arthropods characterized by up to 15 pairs of long, banded legs and three dark stripes running along the body.
They have well-developed compound eyes, which is rare for centipedes. Their last pair of legs often mimics antennae. Typical body length ranges from about one to one and a half inches, though their long legs give them a larger appearance.
In homes, house centipedes complete a series of five to 10 molts over their lifetime, gradually developing more legs with each stage. Newly hatched larvae emerge with just four pairs of legs, and after each molt, they gain additional pairs until they reach the adult stage with the full 15 pairs. The complete growth process from egg to mature adult can take two to three years, depending on environmental conditions such as temperature, humidity, and food availability.
The lifespan of house centipedes is surprisingly long for an arthropod; they survive for three to seven years in total. They typically reach sexual maturity around the third year, meaning they can produce several generations over their lifespan. Egg-laying usually occurs in damp, protected areas like basements, crawl spaces, or behind bathroom baseboards, where the humidity helps the eggs develop. A single female can lay up to 35 eggs in one reproductive cycle.
Fortunately, common house centipedes are not typically dangerous to people. While they are technically venomous, their venom is used for immobilizing small bugs such as cockroaches, termites, ants, spiders, and silverfish, not for harming humans.
Most people will never experience a bite in their lifetime because house centipedes are shy, fast-moving, and actively avoid contact with humans. On the rare occasions that they do bite humans, the effects of their venom are generally mild to negligible.
The fear around house centipedes often comes from their appearance; long legs, quick movements, and a somewhat alien look, rather than any genuine threat. In reality, they can be beneficial in small numbers, helping to reduce populations of more troublesome pests inside the home.
Yes, house centipedes can bite, but such incidents are extremely rare. House centipedes do not have fangs like spiders. Instead, they use forcipules: a pair of modified, claw-like front legs, to inject venom into their prey. While these can pierce human skin, they are small and relatively weak, so in many cases the bite doesn’t even break the skin.
It’s worth noting that a house centipede’s first instinct is always to flee, not fight. They are much faster runners than most household pests, and their speed is part of why they are so hard to catch and why bites are so rare.
If a bite does occur, it may cause localized pain, mild swelling, redness, or itching, symptoms similar to a bee sting. These effects usually fade within hours to a day and rarely require medical treatment unless the person has an allergic reaction, which is very uncommon.
House centipede bite marks may resemble a V-shaped puncture and can cause minor pain, swelling, or redness. Most bites heal quickly with basic first-aid and severe allergic reactions or infections are very rare. As with all bites, always contact a medical professional if you are concerned about any of the symptoms.
In many cases, it’s best to leave house centipedes alone, and for good reason. They are beneficial predators, feeding on a variety of common household pests such as cockroaches, termites, silverfish, spiders, and ants, which helps naturally control infestations.
Indoors, they are generally harmless; they don’t damage property, spread disease, or contaminate food supplies. Some people find their appearance unsettling, and seeing many of them may signal a deeper issue, such as excess moisture or an abundance of insects, so it’s worth investigating and addressing those root causes.
While house centipedes are mostly harmless, other species can deliver far more painful bites and should be treated with caution. One notable example is the giant desert centipede (Scolopendra heros), found in the southwestern United States and northern Mexico.
Up to eight inches long, they have powerful forcipules capable of breaking human skin and injecting venom that can cause intense localized pain, swelling, and in rare cases, nausea or fever.
If you’re facing a centipede problem, start by sealing cracks and gaps around doors, windows, and foundations to block entry points. Then lower humidity levels by using dehumidifiers in damp spaces like basements and bathrooms, and repair any plumbing leaks.
It’s also important to reduce clutter and eliminate moist hiding spots that attract both centipedes and their prey. Since they feed on other insects, addressing underlying pest problems is key as removing their food source makes your home less inviting.
In most cases, house centipedes are more helpful than harmful. They’re natural pest controllers and rarely pose any threat to humans. However, if the presence of centipedes in your house makes you uncomfortable or points to other issues, Western Exterminator is here to help. Contact us today to arrange a free pest inspection.
No, house centipedes are mostly harmless to humans and can help control pests.
Yes, house centipede bites are rare, and their prey is small bugs like spiders, silverfish, cockroaches, and termites, not people.
It’s often better to let them hunt pests unless they bother you, but proper prevention and pest control are more effective than killing at random. For professional help, call in an expert exterminator for house centipedes.
House centipedes can climb walls, but aren’t so good at climbing up smooth surfaces.
They might come back after removal if moisture or other pests remain. Long-term prevention is key to keeping house centipedes out of your property.
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