Bed bugs are caused by one thing: hitchhiking. They don’t appear because of dirt, poor hygiene, or anything you did wrong. Every infestation traces back to bed bugs physically traveling from one location to another on luggage, clothing, furniture, or other personal belongings. Understanding exactly how they spread, what draws them to you, and why they’re so hard to get rid of helps you protect your home.
Bed Bugs Are Hitchhikers, Not a Sign of Filth
The most persistent myth about bed bugs is that they’re attracted to dirty homes. They aren’t. Bed bugs can be found in houses, apartments, hospitals, hotels, public transit, and group living situations regardless of how clean the space is. What they need is access to people, not garbage or grime. A spotless five-star hotel is just as viable a habitat as a cluttered apartment, because the only resource bed bugs require is human blood.
That said, clutter does play a secondary role. Once bed bugs establish themselves, cluttered spaces give them more hiding spots, making them harder to detect and eliminate. Clutter doesn’t cause the infestation, but it can help one grow unnoticed.
How Bed Bugs Get Into Your Home
Bed bugs move from place to place by clinging to objects that people carry. The most common vehicles are suitcases, purses, handbags, backpacks, and clothing. A single trip to an infested hotel room, a friend’s apartment, or even a seat on public transit can introduce bed bugs into your life. They can cross international borders in a suitcase in under 24 hours.
Within a community, infestations spread when people move belongings from one residence to another. Purchasing second-hand upholstered furniture or mattresses is one of the fastest ways to bring bed bugs home. Used dressers, nightstands, and other wooden furniture carry risk too. Bed bugs leave black fecal stains on wood surfaces as they digest blood meals, so checking for dark spots on any used furniture is a practical way to screen before buying.
Electronics, picture frames, and other non-fabric items can also harbor bed bugs, though fabric and wood with crevices are their preferred hiding spots. They tuck themselves into mattress seams, box spring crevices, spaces under baseboards, and any tight gap close to where people sleep or sit.
What Attracts Bed Bugs to People
Bed bugs find their hosts using three main signals: carbon dioxide, body heat, and chemical cues from skin. Every time you exhale, you release CO2, which bed bugs can detect from a distance. Researchers have found that traps releasing CO2 at rates similar to human breathing (roughly 150 to 500 milliliters per minute) reliably attract bed bugs. Your body heat acts as a secondary beacon once they get closer, with surface temperatures in the low-to-mid 40°C range (around 110°F) being particularly attractive. Chemical compounds naturally present on human skin, including those found in sweat, help bed bugs zero in on exposed areas once they’re nearby.
This is why bed bugs feed almost exclusively at night. You’re stationary, breathing steadily, and radiating heat for hours. The combination of signals is strongest when you’re asleep, which is how these insects earned their name.
Spread in Apartments and Shared Buildings
Multi-unit housing presents a unique challenge. Bed bugs don’t just travel on belongings. They can migrate between apartments through wall voids, electrical outlets, plumbing gaps, and ventilation openings. If a neighbor has an infestation, bed bugs can move through shared walls into adjacent units without anyone carrying them.
Some residents have found success sealing cracks, recaulking baseboards, and covering outlets to slow this kind of migration. But these measures are stopgaps. In apartment buildings, treating only one unit often fails because the bugs simply retreat to untreated neighboring spaces and return later. Building-wide inspection and treatment is typically what breaks the cycle.
Travel Is the Biggest Risk Factor
Hotels, motels, and short-term rentals are ground zero for bed bug transmission. High guest turnover means new opportunities every night for bed bugs to arrive and then hitch a ride with the next visitor. Orkin’s 2025 rankings, based on treatment data from May 2024 through May 2025, show that bed bug treatments remain widespread across major metro areas in both residential and commercial settings.
The risk isn’t limited to budget accommodations. Any place where many people cycle through soft furnishings qualifies. Movie theaters, for example, check every box: fabric-covered seats, hundreds of visitors daily, dim lighting, and warm environments. If someone carrying bed bugs sits down, the insects can crawl into seat crevices and later transfer onto the next person’s coat or bag. Public transit seats pose a similar, though lower, risk.
Why Infestations Grow So Quickly
A single fertilized female can launch an entire infestation. Female bed bugs lay about five eggs per day throughout their adult lives, depositing them in sheltered locations like mattress seams, box spring joints, and gaps behind baseboards. The eggs are tiny, roughly the size of a pinhead, and nearly translucent, making them extremely difficult to spot.
Bed bugs develop through five nymph stages before reaching adulthood, requiring a blood meal at each stage. At room temperature, starved bed bugs at any life stage survive an average of about 70 days. Some sources report survival up to a year without feeding under ideal conditions. This means leaving a room vacant for a few weeks won’t starve them out. It also means bed bugs hiding in stored furniture or luggage can remain viable for months, ready to start feeding and reproducing the moment a host returns.
Why They’re Harder to Kill Than They Used to Be
Bed bugs have developed significant resistance to the most common over-the-counter insecticides, particularly pyrethroids, the active ingredient in many household sprays. This resistance is a major driver of their global resurgence over the past two decades. Bed bug populations have evolved multiple defense mechanisms: genetic mutations that make their nerve cells less sensitive to these chemicals, internal enzymes that break down or trap insecticides before they can do damage, and physically thicker outer shells that slow pesticide absorption.
These layered defenses mean that spraying a store-bought bed bug product often does little more than scatter the insects to new hiding spots, potentially spreading the infestation to other rooms. Professional treatment using heat, targeted application of newer chemical classes, or a combination of both is generally what it takes to eliminate an established population. Heat treatments work by raising room temperatures above the lethal threshold for all life stages, bypassing chemical resistance entirely.
Preventing an Infestation
Prevention comes down to awareness at the moments when transfer is most likely. When traveling, inspect hotel mattress seams and headboards before settling in. Keep luggage on hard surfaces or luggage racks rather than on beds or upholstered furniture. When you return home, vacuum suitcases thoroughly and inspect all belongings before bringing them inside.
When buying second-hand furniture, examine every surface with a flashlight. Turn dressers and nightstands over to check underneath. Look for small dark spots (fecal stains), shed skins, or live bugs in seams, joints, and crevices. Wipe surfaces with a light-colored cloth to reveal stains that might not be visible at a glance. Avoid picking up upholstered furniture left on the curb, since there’s often a reason it was discarded.
In apartments, sealing cracks around baseboards, caulking gaps near pipes, and installing outlet covers can reduce the chance of bugs migrating from neighboring units. Mattress and box spring encasements eliminate common hiding spots and make early detection easier, since bugs are forced into the open where you can see them.