Bed bugs are in the middle of a global resurgence that has been building since the 1990s. The problem is serious enough that the EPA, CDC, and USDA all classify bed bugs as a public health pest, though they don’t transmit diseases. What’s driving the surge is a combination of pesticide resistance, urbanization, and international travel, and the trend shows no signs of reversing. Here’s what you need to know about why it’s happening, how to spot an infestation, and what actually works to stop them.
Why Bed Bugs Are Surging Worldwide
The single biggest factor behind the bed bug resurgence is pesticide resistance. Bed bugs have evolved resistance to most major classes of insecticides, including pyrethroids, one of the most commonly used options on the market. They’re also resistant to DDT, which works through a similar mechanism. Even non-chemical approaches are losing ground: there’s evidence that some populations have developed resistance to desiccation, meaning powders like diatomaceous earth that kill by drying out the insects may no longer be reliable.
Two other forces are compounding the problem. More people live in cities than ever before, and bed bugs thrive in densely packed environments where warm bodies are close together and units share walls. At the same time, global travel has exploded, giving bed bugs a reliable way to spread from city to city and continent to continent. Every hotel stay, Airbnb booking, or shared transit seat is an opportunity for the insects to hitch a ride.
Cost creates a vicious cycle. Professional bed bug treatment can run several hundred to thousands of dollars for a single apartment. Low-income communities often can’t afford eradication, and untreated infestations act as reservoirs that continually reseed the surrounding area. This means the epidemic isn’t just a nuisance problem. It’s a structural one, deeply tied to housing inequality.
How to Spot an Infestation Early
Adult bed bugs are reddish-brown, wingless, and roughly the size of an apple seed. An unfed adult looks like a flat disc; after feeding, it swells into an elongated torpedo shape and turns bright red. Immature bed bugs (nymphs) are smaller and translucent whitish-yellow, making them harder to see unless they’ve recently fed, at which point they look like plump raspberry seeds. Eggs are pearl-white, about the size of a pinhead, and develop visible eyespots after five days.
You’re more likely to find evidence of bed bugs than the bugs themselves. The most reliable sign is fecal spotting: small black specks (not red, because the blood has already been digested) that feel smooth to the touch. These spots typically appear in clusters of ten or more. Check along mattress seams, on the tag, on the wood frame of box springs, behind the headboard, along baseboards, at ceiling and wall junctions, behind picture frames, and around electrical outlets.
Molted skins are another giveaway. Bed bugs shed their exoskeletons five times before reaching adulthood, and those pale, translucent husks accumulate along mattress seams, behind headboards, and stuck to personal belongings. If you’re looking for the bugs themselves, focus on tight cracks and crevices: screw holes in bed frames, where box spring fabric is stapled to wood, behind loose wallpaper or chipped paint, inside curtain rods, inside baseboard heaters, and along the interior frame of closet doors.
What Actually Kills Them
Heat is the most effective weapon against bed bugs because they haven’t developed resistance to it. The thermal death point for adults and nymphs is 118°F; eggs require a slightly higher 122°F. At lower temperatures, between 112°F and 115°F, bed bugs can be killed, but they need consistent exposure for several hours. Professional heat treatments typically raise the ambient room temperature to 135°F and hold it there for four to five hours to ensure heat penetrates into walls, furniture, and other hiding spots.
For smaller items like clothing and bedding, a standard household dryer on high heat will do the job. Washing alone isn’t enough, since water temperatures in most home machines don’t reach lethal levels consistently. The dryer cycle is what kills them.
Chemical treatments still play a role, but the widespread resistance problem means they often need to be combined with heat or other methods. A pest management professional may use a rotation of different chemical classes to reduce the chance of resistance. The days of a single spray solving the problem are largely over, which is part of why treatment costs have climbed so high.
How to Protect Yourself While Traveling
Hotels and short-term rentals are the most common way bed bugs enter your home. A quick inspection when you arrive at a room can save you months of trouble. When you first walk in, don’t put your luggage, coat, or personal belongings on the bed. Place everything on a luggage rack, a hard-surface table, or in the bathtub while you check the room.
Using a flashlight, pull back the sheets (the top comforter rarely gets the same laundering as sheets) and inspect mattress seams, especially the corners, for small black or brown specks. Check behind the headboard, paying close attention to tight cracks and joints. Inspect the folds and crevices of nightstands or other furniture near the bed, and scan the carpet and baseboards closest to the sleeping area. If you find any evidence, report it to the front desk immediately and request a different room, ideally not adjacent to the infested one.
When you return home, inspect your luggage seams and clothing before bringing anything inside. Clothing should go straight into the washer and dryer. If you find signs of bed bugs on luggage or other belongings, don’t bring them into the house. Arrange for heat treatment or leave items sealed in a black plastic bag in direct sunlight (in warm climates) until you can address the problem.
Why This Epidemic Is Hard to Reverse
Unlike mosquitoes or cockroaches, bed bugs feed exclusively on blood and live in close association with people. They don’t wander in from outdoors. Every infestation traces back to a bug or egg that traveled on a person, a piece of furniture, or a bag. That makes them uniquely difficult to control at a population level, because there’s no way to treat the environment broadly the way you might spray for outdoor pests.
The cost barrier is arguably the most stubborn part of the problem. A family that can’t afford a $1,500 heat treatment doesn’t stop having bed bugs. They continue living with them, and the infestation grows and spreads to neighbors, coworkers, and anyone who visits. Apartment buildings are especially vulnerable because bed bugs travel through shared walls, electrical conduits, and plumbing chases. Even if one tenant pays for treatment, reinfestation from an untreated neighboring unit can happen within weeks.
Some cities have responded with public health programs that subsidize treatment for low-income residents, recognizing that untreated infestations are a community-wide problem, not just an individual one. But these programs remain the exception. Until treatment becomes more accessible and affordable, the conditions that sustain the epidemic will persist.