Bed bugs: the bites, the evidence, and getting rid of them
Last updated September 3, 2026.
Bed bugs are small, flat, apple-seed-sized insects that hide in mattresses and furniture by day and feed on sleeping humans by night. They are not a sign of dirtiness, they spread through luggage and second-hand furniture rather than poor hygiene, and while their bites are harmless to most people, an infestation is miserable and stubbornly hard to clear without professional help.
What do the bites look like?
Small, red, intensely itchy bumps, classically in a line or cluster of three or more (breakfast, lunch, and dinner), on skin exposed during sleep: face, neck, arms, hands. They appear in the morning, since the feeding happens overnight. Reactions vary hugely: some people barely react, others get large weals. The bites themselves do not transmit disease, but scratching can infect them. The pattern (new itchy bumps each morning) matters more than any single bite.
How do you confirm them?
Look for the evidence, not just the bites. Check mattress seams, the bed frame, behind the headboard, and skirting boards for: live bugs (reddish-brown, flat, 5mm), shed skins, tiny white eggs, black faecal spots that smear like a felt-tip mark, and small blood spots on sheets. A sweet, musty odor appears in heavy infestations. Bites without any physical evidence usually have another cause; a professional pest inspection settles uncertainty.
What actually gets rid of them?
- Professional pest control: the reliable route; bed bugs resist many shop-bought sprays and hide where sprays cannot reach. Treatment usually combines insecticides with heat, and takes two to three visits.
- Heat kills them: wash bedding and clothing at 60C and tumble-dry on hot for 30 minutes; a hot dryer alone treats items that cannot be washed.
- Isolate the bed: mattress and base encasements trap bugs inside, interceptor traps under bed legs catch travelers, and pulling the bed from the wall reduces bridges.
- Vacuum and declutter: thorough vacuuming of seams, frames, and skirtings, immediately disposing of the bag; less clutter means fewer hiding places.
- Do not spread them: avoid moving furniture between rooms or throwing infested items out without wrapping; a dragged mattress seeds the whole building.
When is it an emergency?
Bed bugs are a quality-of-life problem, not a medical one. See a doctor if bites become infected (increasing pain, redness, warmth, pus, or fever), if you get large allergic reactions to bites, or if the infestation and sleep loss are affecting your mental health, which is common and legitimate to raise. Signs of a severe allergic reaction (facial swelling, breathing difficulty, dizziness) after any insect bite need emergency care. Pymander's escalation routing is built and tested specifically for this class of decision; see the safety architecture working paper.
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Common questions
Do bed bugs mean my home is dirty?
No, and the stigma delays treatment for no good reason. Bed bugs feed on blood, not dirt; spotless homes and five-star hotels get them. They arrive as hitchhikers: in luggage after travel, in second-hand furniture, on clothing, and through walls from neighboring flats. Clutter gives them more hiding places and makes treatment harder, but it did not attract them. The correct response to finding them is prompt professional treatment, not embarrassment.
Can I get rid of bed bugs myself?
You can suppress them; clearing an established infestation without professionals rarely works. The home measures that genuinely help: 60C washing and hot tumble-drying for all bedding and clothing, mattress and base encasements, interceptor traps under bed legs, thorough repeated vacuuming of seams and skirtings, and decluttering. Shop-bought sprays mostly fail because bugs hide deep in furniture and many populations resist common insecticides. Professional heat or combined treatment is the reliable endpoint for anything beyond the earliest stage.
Do bed bugs spread disease?
They are not known to transmit any disease to humans, which is their one mercy. Their harm is the bites (intensely itchy, sometimes blistering or allergic), secondary skin infection from scratching, sleep disruption, and a real psychological toll: anxiety, insomnia, and a feeling of contamination are well documented. Those effects are legitimate health impacts and worth mentioning to a doctor if they build up, especially while a slow eradication drags on.
How do I avoid bringing bed bugs home from travel?
The hotel routine that works: inspect the mattress seams and headboard before unpacking; keep luggage on the metal rack or in the bathroom, never on the bed or floor; on returning home, unpack straight into the washing machine and run everything through a hot dryer (heat kills bugs at any life stage, including eggs); and store suitcases away from bedrooms, ideally in a garage or sealed bag. A found bug in a hotel room warrants an immediate room change, not adjacent, or a different hotel.
Why do the treatments keep failing?
The usual reasons: eggs survive the first treatment (they resist most insecticides, which is why professionals schedule return visits to catch newly hatched nymphs); bugs hide where sprays never reach (inside bed frames, behind skirtings, inside electrical sockets); the infestation is reseeding from a neighboring flat or a regularly visited place; or the wrong insect is being treated (carpet beetles and fleas cause similar bites). Persistent cases need the pest controller back for a re-survey rather than another identical spray.
Should I throw away my mattress?
Usually not. Discarding furniture is the move people regret: it costs money, it rarely fixes the problem (bugs live in the frame, skirtings, and furniture too), and dragging an infested mattress through the building drops bugs along the route. A proper mattress and base encasement traps whatever is inside, where it dies over the following year, and lets you keep the mattress. Disposal only makes sense for heavily infested, damaged items, wrapped and labeled before removal, after professional treatment has started.