Which Bed Bug Species Are Found in the UK?
The common bed bug (Cimex lectularius) is responsible for virtually all bed bug infestations in UK homes, hotels, and hostels. A second species, the tropical bed bug (Cimex hemipterus), is occasionally encountered in the UK but remains rare.
In practice, the treatment approach is identical for both species. However, understanding bed bug biology and how to distinguish them from similar-looking insects is valuable for confirming an infestation.
Common Bed Bug (Cimex lectularius)
The common bed bug is the species you will encounter in almost every UK bed bug case. It is found worldwide in temperate climates and has been associated with humans for thousands of years.
- Size: adults are 5–7mm long — roughly the size and shape of an apple seed.
- Colour: unfed adults are flat, oval, and reddish-brown. After feeding, they become swollen, elongated, and darker red.
- Wings: bed bugs are wingless and cannot fly.
- Movement: they cannot jump (unlike fleas). They crawl and can travel 1–2 metres per minute.
- Nymphs: translucent to pale yellow when unfed, becoming reddish after feeding. First instar nymphs are approximately 1.5mm — very difficult to see.
Tropical Bed Bug (Cimex hemipterus)
The tropical bed bug is found primarily in tropical and subtropical regions but is occasionally introduced to the UK through international travel and imported goods.
It is visually almost identical to the common bed bug — the differences (slightly narrower thorax, different body hair patterns) require microscopic examination to distinguish. Behaviour, feeding habits, and treatment are the same.
If you have bed bugs in the UK, assume they are Cimex lectularius unless a specialist confirms otherwise.
Insects Commonly Mistaken for Bed Bugs
Several other insects look similar to bed bugs and are frequently misidentified. Correct identification is important because the treatment approach differs.
- Carpet beetle larvae — small, hairy, oval larvae found in carpets and under furniture. They feed on natural fibres, not blood. Adults are small, round beetles (2–4mm) with mottled colouring.
- Booklice (psocids) — tiny (1–2mm), pale, soft-bodied insects found in damp areas, on books, and on wallpaper paste. They do not bite.
- Spider beetles — small (2–5mm), round, reddish-brown beetles that superficially resemble bed bugs. They feed on dried food products, not blood.
- Bat bugs (Cimex pipistrelli) — almost identical to bed bugs but associated with bat roosts. If bed bug-like insects are found near a loft or roofline (rather than around a bed), bat bugs should be considered.
- Fleas — smaller (2–3mm), narrower, and laterally compressed. Fleas jump; bed bugs do not.
How to Confirm Bed Bugs
If you are unsure whether you are dealing with bed bugs, look for multiple indicators together.
- Live bugs matching the description above, found in or near the bed.
- Dark faecal spots on mattress seams, bed frame joints, and skirting boards.
- Shed skins — translucent casings near harbourage areas.
- Blood spots on bedding.
- Bites in clusters or lines on exposed skin.
- If you find suspected bed bugs, you can place one in a sealed bag or container and show it to a pest control technician for identification.
Why Identification Matters
Correct identification prevents unnecessary treatment and ensures the right approach is used. Treating for bed bugs when the problem is actually carpet beetles (or vice versa) wastes time and money.
A professional bed bug inspection will confirm the species, assess the extent of the infestation, and recommend the right treatment. Contact BuzzKill for a free inspection.
Need professional help? BuzzKill offers fast, reliable bed bug removal services across London and Essex.