I’ve had bed bugs treated and still have them. Why?

Because bed bugs are one of the hardest household pests to clear, and when a treatment fails there is usually a reason you can find. It is rarely about you doing something wrong. Paying again and again while you dread going to bed is exhausting, and that feeling is normal. The way out is to work out which reason applies, and to track the numbers so you know when it is really over.

Is it still the first round?

Many treatments are a course of visits, not one. Eggs can survive a visit and hatch later, so seeing a few bugs or new bites between visits can be part of the plan. Ask the company what they expect you to see, and for how long. If the course is finished and you are still being bitten, read on.

Why bed bugs survive treatment

• Missed hiding places. Bed frame joints, headboards, bedside tables, sofa seams, curtain hems, skirting, picture frames. If only the mattress was treated, the rest of the room was not.
• Things moved before treatment. Bedding, clothes or furniture carried to another room can take bed bugs with them.
• Sleeping somewhere else. It feels like escape, but bed bugs follow people. The sofa or the spare room becomes a second problem, and the treated bed has no one to draw them out.
• Resistance. In many places bed bugs have become resistant to some common insecticides. If the same product was used every time, ask whether the company will change approach, or consider heat.
• Next door. In flats and shared houses they can come through walls and shared spaces. Treating one home while the neighbour’s is untreated can go round in circles.
• Coming back in. Travel, a work bag, a visitor, a second-hand chair. A new bed in an untreated room can be reinfested quickly.
• DIY on its own. Hand killing, shop sprays and diatomaceous earth can help at the edges, but they rarely clear bed bugs alone. See bed bugs without an exterminator and diatomaceous earth.

What to ask the company now

1. What did you treat, with what, and where? Ask for it in writing.
2. Which rooms did you check? The sofa, the rooms next to the bedroom, the car if you think it matters.
3. Was any preparation missed? Better to hear it now than repeat it.
4. Will you change method this time? A different product, heat, or both.
5. Are return visits included? For how long, and in writing.
6. Should the neighbours be inspected?

Track it with interceptors

Interceptors are small cups that go under each bed leg. Pull the bed a little away from the wall and tuck the bedding in so nothing touches the floor. Now a bed bug heading for you has to climb a leg, and it ends up in the cup.

Check them on the same day each week and write down what you find, adults and young ones apart. Falling numbers mean the treatment is working. Steady or rising numbers are evidence you can take back to the company. Our page on bed bug interceptors shows how to set up and read them.

Your health: if bites blister, spread, look infected, or you feel unwell, see a doctor or pharmacist. Weeks of bad sleep and dread are worth raising with a doctor too. See when the anxiety stops.

When it is a building problem

If you rent or live in flats, tell your landlord or managing agent in writing, with your dates and counts. Repeated failures in one flat often point to the building. In the UK, the council’s environmental health team can advise on housing conditions, and Citizens Advice can explain your options. Elsewhere, ask your local tenancy board or housing authority. Our page for renters and how to document pests help here.

When to try someone else

If the counts are not falling after the full course, and the company cannot explain why or will not change approach, a second opinion is reasonable. Give the new company the first one’s written report and your interceptor log. Compare quotes the way we set out in is heat treatment worth it.