How to check for bed bugs in your home: a step-by-step checklist
updated 11 July 2026
Quick answer
To check for bed bugs, inspect the bed thoroughly: mattress seams, the frame, slats, and headboard. You're looking for tiny black dots (droppings), empty shed skins, pale eggs, and the insects themselves, about the size of an apple seed. The white sheets test and interceptor traps slipped under the bed legs help too. The same careful-inspection principle works for fleas and cockroaches - only the places you search change.
Step by step
- 1
Get ready for the inspection
Grab a flashlight (the one in your phone will do), a payment card or another stiff piece of plastic for combing through crevices, and clear tape for sticking down any specimens you find. Inspect in good light, ideally early in the morning, because bed bugs are most active before dawn. Strip the bedding and expose the mattress.
- 2
Check the mattress seams and headboard
Slowly run the card along the mattress seams, folds, and labels, especially near the corners, because those are bed bugs' favorite hiding spots. Then examine the bed frame, slats, base, and headboard, looking into every crevice and screw hole. Pay attention to wood joints and the places where the mattress touches the frame.
- 3
Recognize the signs of an infestation
You're looking for four things: live insects the size of an apple seed with a flattened, brown body; tiny black dots the size of a poppy seed, which are droppings that smear rusty-red when wiped with a damp tissue; pale, translucent skins shed during molting; and white, oval eggs the size of a pinhead hidden in crevices.
- 4
Do the white sheets test
Put fresh, white, patternless sheets on the mattress. Against a light background it's much easier to spot the dark dots of droppings, small blood stains from a crushed insect, and the bed bugs themselves during a night check. For a few days, check the sheets with a flashlight in the middle of the night or right after waking, before you straighten them.
- 5
Place interceptor traps under the bed legs
Buy or make interceptors: flat dishes with a smooth, slippery rim that you slip under each leg of the bed. Bed bugs traveling between the bed and the rest of the room fall in and can't climb back out along the smooth wall. Pull the bed away from the wall and check the traps every morning - it's a simple way to confirm the insects are there and gauge the scale.
- 6
Treat marks on your skin as a hint, not proof
A telltale bed bug pattern is 2-3 marks in a line or cluster, often on parts of the body exposed during sleep. Treat this only as a hint about where and what to look for, not as firm proof, because skin reactions vary widely from person to person. The physical evidence on the bed is always decisive: insects, droppings, and shed skins.
How to check for fleas in your home
Fleas give themselves away in a different spot than bed bugs. Instead of the bed, search your pet's bedding, carpets, gaps between floorboards, and the upholstery where the dog or cat lies. Part your pet's fur against the grain and look for small, fast-moving brown insects and black specks, which are droppings.
A proven test is white socks. Put on tall, light-colored socks and walk around the carpet or near the pet's bed for a few minutes. Dark fleas stand out against the white fabric as they try to jump onto your legs. A second test: lay a damp white paper towel on the floor - black specks that smear rusty-red are digested blood in flea droppings.
How to check for cockroaches in your home
Cockroaches are nocturnal, so the best method is a surprise inspection of the kitchen in the dark. Walk into the kitchen or bathroom at night and switch the light on suddenly. If you have roaches, you'll see them scatter into crevices. Look behind the fridge, under the sink, behind the oven, and in cabinet gaps.
The signs to look for are tiny black dots and smears resembling ground pepper (droppings), a sweetish musty smell when the population is large, and oothecae - brown, capsule-like egg cases glued into corners. Also set out sticky traps along the baseboards overnight, and count how many insects you've caught in the morning.
What to do once you confirm the pests
If the inspection confirms insects, don't panic and don't move your things to other rooms - that's the easiest way to spread the problem through the whole home. Take photos of the evidence you find so you can track progress and show it to a pest control company if needed.
The next step is a targeted fight against the specific species, which we cover in a separate guide on getting rid of bed bugs. The faster you move from detection to action, the smaller the population and the easier it is to control.
Frequently asked questions
›How do I check for fleas in my home?
Walk around the carpet in tall white socks and watch whether dark insects jump onto them. Also comb your pet's fur against the grain and look for brown specks that smear rusty-red on damp white paper - those are flea droppings.
›How do I check for cockroaches in my home?
Walk into the kitchen at night and switch the light on suddenly - cockroaches will scatter into crevices. Behind the fridge and under the sink, look for black dots of droppings and brown egg cases (oothecae). Sticky traps set out overnight help too.
›What do bed bug marks on sheets look like?
They're tiny black dots the size of a poppy seed (droppings) and small rusty blood stains left by a crushed insect. They show up best on white, smooth sheets, so it's worth putting those on when you suspect bed bugs.
›Can you see bed bugs with the naked eye?
Yes. An adult bed bug is about 5-7 mm (a quarter inch) long, the size of an apple seed, with a flattened brown body, and is visible without a magnifier. The pale eggs and young nymphs are harder to spot, which is why a flashlight and combing through crevices help.
›What time of day is best for finding bed bugs?
Early morning, roughly an hour before dawn, when the insects are most active. If you inspect during the day, use a strong flashlight and comb carefully through the mattress seams and frame crevices, because bed bugs hide in daylight.