Stink bugs vs bed bugs
Not sure which one you are dealing with? Check the table — shape and location tell you almost immediately.
Comparison table
| Trait | Stink bug | Bed bug |
|---|---|---|
| Shape | Shield-shaped, flat back | Oval, flat, apple-seed shaped |
| Size | About 1.7 cm (fingernail) | About 0.5 cm |
| Color | Brownish-green or gray-brown | Reddish-brown |
| Where they hide | Near sunny windows, walls, attics | Mattresses, box springs, bed frames |
| Bite people? | No | Yes — itchy welts |
| Smell when disturbed | Yes — that is the name | No (a musty odor at most) |
| Move at night? | Mostly active in daylight | Active at night, hide by day |
| Level of threat | Nuisance, no damage | Health nuisance, hard to remove |
Quick checks you can do right now
- Where did you find it? Mattress and bed frame = think bed bug. Sunny window, windowsill or wall = stink bug.
- Does it smell when touched? Stink bugs release a sharp odor. Bed bugs do not.
- Look at the shape. Shield-shaped and large = stink bug. Small and oval, feeding spots on the mattress = bed bug.
If it is a stink bug, the removal guide above gets you sorted in one afternoon. If it is a bed bug, call a professional — early action matters more than any DIY tip.
More guides
Frequently asked questions
Are stink bugs or bed bugs worse?
Bed bugs are worse: they bite and feed on blood, and they are hard to remove without professional help. Stink bugs do not bite, sting or damage your home — they are mainly a smelly nuisance.
Can stink bugs turn into bed bugs?
No. They are completely different insects. A stink bug will never become a bed bug, and neither one turns into the other at any life stage.
Do stink bugs bite like bed bugs?
No. Stink bugs have no interest in biting humans or pets. Their only defense is the odor they release when disturbed.
Why do I find bugs near my bed?
Small reddish bugs near a mattress are usually bed bugs. If the bugs are near a sunny window and look shield-shaped, they are stink bugs that wandered indoors. Location plus shape is the best clue.