Bed bugs are unpleasant but rarely dangerous. The BPCA says they are not known to spread disease, and the NHS says their bites do not usually cause other health problems and usually clear up within a week or so. The real risks are itchy bites, skin infection from scratching, occasional allergic reactions and lost sleep.
Reviewed by James Rhoades, Owner, ThermoPest · Last reviewed 15 October 2026
If you’ve just found bites or bugs, it’s normal to worry about what they could do to you or your family. This guide sets out what the evidence says about disease, Lyme disease, anaemia, allergies and the toll on sleep and mood, and when to get medical advice. We’re pest specialists, not doctors, so we describe the risks rather than diagnose them.
Are bed bugs dangerous to humans?
For most people, no. Bed bugs feed on blood, usually at night, and the main effect is the bites themselves. The NHS describes bites as often raised and itchy, in a line or grouped together, on skin exposed while sleeping, such as the face, neck and arms. Some people react more strongly, and some don’t react at all. For a closer look, see our guide to bed bug bites.
In short, the health effects come down to itching, loss of sleep and, rarely, allergic reactions. That’s the realistic picture. Bed bugs are a problem worth dealing with promptly, but they are not a medical emergency in themselves.
| Concern | What the evidence says | What to do |
|---|---|---|
| Spreading disease | Not known to spread diseases to people (BPCA) | No action needed for disease; focus on the bites and the bugs |
| Itchy bites | Common; usually clear up in a week or so (NHS) | Cool compress, avoid scratching, ask a pharmacist |
| Skin infection | Possible if scratching breaks the skin (NHS) | See a GP if redness, pain or swelling spreads |
| Allergic reaction | Severe reactions are possible but rare (NHS) | Call 999 for swelling of the lips or throat, or trouble breathing |
| Anaemia | Very rare; a handful of published case reports in heavy, long-standing infestations | See a GP if you feel unusually tired, breathless or pale |
| Sleep and anxiety | Insomnia and anxiety are common effects | Talk to someone; get the infestation confirmed and treated |
Do bed bugs transmit disease?
No disease is known to be spread to people by bed bugs. The BPCA says they are not known to spread disease, and the NHS says bites do not usually cause other health problems. This sets them apart from mosquitoes and ticks, which do spread infections.
You may read claims online that bed bugs carry germs. Carrying something is not the same as spreading it to people, and neither the NHS nor the BPCA lists any disease spread by bed bugs. If you’ve been bitten, you don’t need to worry that you’ve caught something from the bug.
Can you get Lyme disease from bed bugs?
No. The NHS describes Lyme disease as a bacterial infection spread to humans by infected ticks. Bed bugs aren’t ticks, and they aren’t known to spread Lyme disease or any other disease. If you’ve been walking in long grass or woodland and later notice a circular or oval rash, that can be a sign of a tick bite, which bed bugs don’t cause. The NHS Lyme disease page explains what to look for and when to see a GP.
Health Problems Bed Bug Bites Can Cause
While they don’t spread disease, bed bugs can still affect your health in a few ways. Most are mild and short-lived.
Itching and Skin Irritation
The itch is the most common complaint. New bites keep turning up while the bugs are still there. The NHS suggests a cool, clean, damp cloth to ease itching and swelling. A pharmacist can recommend something for the itch and check it suits you; the NHS advises children under 10 and pregnant women to get advice from a doctor before using hydrocortisone cream, a mild steroid cream.
Skin Infection From Scratching
Scratching can break the skin and let bacteria in. The NHS advises not scratching the bites to avoid infection. Intense itching makes that hard, so it’s worth easing the itch early. Keep nails short, keep the skin clean, and watch for redness, warmth, pain or swelling that spreads beyond the bite. That can be a sign of infection that needs treatment from a GP.
Allergic Reactions
Some people get large, swollen or very painful bites, and some react to several bites at once. The NHS says a severe allergic reaction (anaphylaxis) is possible but rare. Strong reactions can look like hives; our guide to bed bug bites vs hives explains how to tell them apart.
Can bed bugs cause anaemia?
Very rarely, and only in unusual circumstances. Anaemia from bed bugs isn’t something most people with an infestation need to worry about. It has been reported in a small number of published cases, where a very heavy infestation went untreated for a long time.
In the few reported cases, doctors found unexplained iron-deficiency anaemia in someone whose home turned out to have a severe, long-standing infestation, with very large numbers of bugs in the mattress and bedding. Blood counts recovered once the person was moved and the home was treated. The cases mostly involved people who were socially isolated or less able to look after themselves.
So the people at most risk are those who can’t easily notice or deal with an infestation themselves, such as an older relative living alone or someone who is unwell. If you’re worried about a family member, checking their bedroom and getting help in is the most useful thing you can do.
Signs of Anaemia to Mention to a GP
The NHS lists symptoms of iron deficiency anaemia including tiredness and lack of energy, shortness of breath, noticeable heartbeats, paler than usual skin and headaches. These have many possible causes, so don’t assume bed bugs are behind them. If you notice them, especially alongside an infestation, see a GP, who can arrange a simple blood test.
Can bed bugs make you sick or cause headaches?
Bed bugs aren’t known to spread any illness, and the NHS doesn’t list headaches among the effects of bites. What bed bugs can do is cost you sleep, and a run of poor nights can leave anyone feeling tired, low and unwell. If you have frequent headaches, a GP or pharmacist is the right person to ask, as they have many causes.
Bed Bugs and Your Mental Health
This is often the hardest part. Insomnia and anxiety are common when you’re living with bed bugs, and many people find they can’t relax in their own bed. You might lie awake checking the sheets, feel itchy even when you haven’t been bitten, or feel embarrassed to tell anyone.
- It isn’t about cleanliness. Bed bugs are carried in on luggage, furniture and clothing. A tidy, clean home can get them as easily as any other.
- Talk to someone. A friend, family member or your GP can help, especially if worry or poor sleep is lasting.
- Get an answer. Not knowing is often worse than knowing. Confirming whether you have bed bugs, and where they are, lets you make a plan.
If you’re being bitten but can’t find anything, our guide to getting bitten at night with no bed bugs in sight covers other causes to rule out. And if you’ve read frightening stories online, most are myths; see can bed bugs go in your ear?
Who is more at risk?
Anyone can be bitten, but some people are more likely to have problems:
- Babies and young children, who scratch without meaning to. If you’re worried about a child’s rash, get advice from a pharmacist, GP or NHS 111.
- Older or less mobile people, who may not notice an infestation or be able to deal with it. The anaemia case reports above mostly involved people in this situation.
- People who react strongly to bites, who may get large, swollen or blistering reactions.
When to Get Medical Advice
This section is general information, not medical advice. Most bites settle on their own.
The NHS advises you to see a GP if bites are still very painful, swollen or itchy after trying treatments from a pharmacist, or if the pain or swelling around the bites is spreading. See a GP too if you feel unusually tired, breathless or pale. If you’re not sure what to do, contact NHS 111.
Call 999 if your lips, mouth, throat or tongue suddenly become swollen, you’re struggling to breathe, or your throat feels tight. These can be signs of a serious allergic reaction; the NHS anaphylaxis page lists the full set of warning signs. See also the NHS bedbugs page.
Dealing With the Cause
Treating bites eases the itch, but new ones will keep coming while the bugs are still in the bedroom. Shop-bought sprays and foggers tend to scatter bed bugs into new hiding places rather than clear them. The first step is confirming what you’re dealing with: a professional bed bug inspection finds where they’re hiding and how far they’ve spread. If treatment is needed, ThermoPest’s approach is heat-led, with targeted spray where it’s needed, and return visits may be part of the plan.
FAQs
Can bed bugs make you anaemic?
Only very rarely. A small number of published case reports describe anaemia in people living with very heavy infestations for a long time, mostly older or isolated people. For most people with bed bugs, the amount of blood lost isn’t a concern. If you feel unusually tired, breathless or pale, see a GP.
Do bed bugs carry Lyme disease?
No. The NHS says Lyme disease is spread to humans by infected ticks, and bed bugs are not known to spread diseases to people. Bed bug bites can itch and occasionally become infected from scratching, but they won’t give you Lyme disease.
Why are bed bugs dangerous if they don’t spread disease?
Mainly because of their effect on daily life. Bites can itch badly, scratching can lead to skin infection, a few people have strong allergic reactions, and many people lose sleep or feel anxious. Dealing with the infestation promptly is the best way to limit all of these.
Can bed bugs cause long-term health problems?
For most people, no. The NHS says bites usually clear up on their own in a week or so. Problems that last tend to come from infected scratches, rare cases of anaemia in severe infestations, or ongoing worry and poor sleep. A GP can help with any of these.
Worried about bed bugs at home?
If you’ve found bites or signs on the mattress, an inspection will confirm what you’re dealing with, so you can stop guessing. ThermoPest is a member of the BPCA and NPTA, and our technicians arrive in unmarked vans.
