Earwigs show up in bathrooms because they’re drawn to moisture. These nocturnal insects spend daylight hours hiding in tight, damp spaces, and a bathroom with residual humidity from showers, slow-draining sinks, or small leaks is an ideal habitat. The good news: they’re harmless, and a few targeted fixes can keep them out for good.
Why Bathrooms Specifically
Earwigs need moisture to survive, and bathrooms are often the most humid room in a house. Every hot shower sends a wave of water vapor into a small, enclosed space. If your exhaust fan is weak, broken, or never turned on, that humidity lingers for hours, soaking into grout lines, pooling behind toilets, and keeping the air damp well into the night. That’s exactly when earwigs are active and searching for shelter.
They’re also attracted to the organic material that accumulates in bathrooms: soap scum, mildew, hair, and the thin biofilm that builds inside drains. These aren’t just nuisances for you. For a small insect, they’re food sources. A bathroom that stays warm, humid, and undisturbed overnight checks every box an earwig is looking for.
How They Get Inside
Earwigs don’t come up through drains (a common assumption). They typically enter from outside the house and work their way to the most humid room they can find. The routes are predictable: gaps around window frames, spaces where plumbing pipes pass through walls, cracks in the foundation, torn window screens, and door sweeps that no longer sit flush against the threshold. Utility penetrations, where cable lines or pipes enter the house, are another frequent entry point because they’re rarely sealed tightly.
Once inside, earwigs are hard to spot during the day. They’re secretive and nocturnal, hiding in small cavities, behind baseboards, or under bathroom cabinets until dark. You might find one in the tub or on the floor at night and assume it crawled out of the drain, when it actually squeezed through a gap in the wall hours earlier.
Are Earwigs Dangerous?
No. Earwigs look intimidating because of the curved pincers (called cerci) at the end of their abdomen, but they use those for defense against other insects and for catching small prey. They don’t bite people, they don’t spread disease, and their pincers carry no venom. If you pick one up, it might pinch you reflexively, but the pinch is mild and doesn’t break the skin in most cases.
The persistent myth that earwigs crawl into human ears and burrow into the brain is entirely false. The name traces back to Old English, “ear wicga,” roughly meaning “ear creature,” and the folklore snowballed from there. While there are rare, incidental cases of an earwig being found in someone’s ear (the same way any small insect might wander into an ear canal), they have no interest in doing so and are physically incapable of tunneling into brain tissue or laying eggs there.
How Fast They Can Multiply
A single female earwig lays between 15 and 70 eggs per clutch, and those eggs hatch in as few as 5 days or as many as 50, depending on the species and temperature. What makes earwigs more prolific than you’d expect is that mothers don’t stop at one clutch. After the first batch of young leaves, a female often produces additional clutches over the following months. Females can live up to 18 months, giving them time for several rounds of reproduction.
This means a handful of earwigs in your bathroom can become a recurring presence if the conditions that attracted them stay the same. You’re unlikely to face a massive indoor infestation, since bathrooms don’t provide enough food for large colonies, but ignoring the problem lets the cycle repeat every season.
Reducing Moisture to Drive Them Out
The single most effective step is lowering bathroom humidity. Run your exhaust fan during every shower and leave it on for at least 15 to 20 minutes afterward. If your bathroom doesn’t have an exhaust fan, a small dehumidifier or even cracking a window after showers makes a real difference. The goal is to keep indoor humidity below 50%, which is the threshold where moisture-seeking pests lose interest.
Check for hidden moisture sources too. A slow leak under the sink, condensation on the toilet tank, or a dripping shower valve all create the kind of persistent dampness earwigs rely on. Fix leaks the same week you notice them. Wipe down wet surfaces after bathing if your ventilation is limited.
Sealing Entry Points
Once the moisture is under control, close off the routes earwigs use to get in. These are the key areas to check:
- Window and door frames: Caulk any visible gaps, especially where the frame meets the wall.
- Pipe and cable penetrations: Seal around every pipe, wire, or cable that passes through a bathroom wall with appropriate caulk or expanding foam.
- Foundation cracks: Use masonry caulk for thin cracks and hydraulic cement for wider ones.
- Window screens: Replace any that are torn or don’t fit tightly.
- Door sweeps: Swap out any that leave daylight visible beneath the door.
- Vents: Cover exterior vents with fine mesh screening if the factory louvers have gaps between them.
This work doesn’t have to happen all at once. Start with the bathroom itself, then work outward to the rest of the house.
Outdoor Conditions That Push Them Indoors
Earwigs usually live outside in damp soil, leaf litter, mulch beds, and under stones or wood piles. They move indoors when outdoor conditions become either too dry (summer heat) or too wet (heavy rain flooding their hiding spots). What’s happening in the first few feet around your foundation matters a lot.
Keep mulch raked back a few inches from your siding so that strip stays bare and dry. Move firewood and lumber stacks at least 20 feet from the house and store them off the ground on a rack. Clean gutters twice a year and make sure downspouts discharge at least three feet from the foundation. If you water your garden or lawn, do it in the morning rather than at dusk, so the soil and mulch dry out before earwigs become active overnight. Fix leaky outdoor spigots and hose connections promptly.
These steps remove the staging areas earwigs use before entering your home. If there’s no damp habitat next to your foundation, far fewer earwigs will be close enough to find their way inside.
Dealing With Earwigs Already Inside
For the earwigs currently in your bathroom, you can simply remove them by hand or with a piece of tissue. They’re not fast, and they don’t fly indoors. If you’re seeing several at a time, diatomaceous earth is an effective, non-chemical option. It’s a fine powder made from fossilized algae that dehydrates insects on contact. Dust it lightly behind baseboards, under the bathroom cabinet, along windowsills, and in any crack or crevice where you’ve noticed activity. It works passively and leaves no chemical residue, though you’ll want to reapply after cleaning.
A simple trap also works well: roll up a damp newspaper and leave it on the bathroom floor overnight. Earwigs will crawl inside seeking shelter. In the morning, toss the whole thing in an outdoor trash bin. Repeat for a few nights to clear out stragglers while your sealing and moisture-reduction efforts take hold.