How to Tell If You Have Bed Bugs

Bed bugs are hard to spot on purpose. They are small, they hide in tight cracks, and they feed at night while you sleep. Many people only suspect a problem after weeks of unexplained itching. The good news is that a careful inspection can confirm or rule out bed bugs without any special equipment. Here is what to look for.

Signs you can see

The most reliable evidence is physical. Check for these, in roughly this order of usefulness:

Live bugs. Adult bed bugs are about the size of an apple seed: flat, oval, and reddish-brown, turning rounder and darker after a meal. Young bugs (nymphs) are smaller and pale or translucent, which makes them easy to miss.
Dark specks. Bed bug droppings look like tiny ink dots, about the size of a pen tip. On fabric they smear like a marker if you dab them with a damp cloth.
Blood spots. Small rusty or reddish stains on sheets and pillowcases come from crushed bugs or from bites that keep bleeding slightly after a feeding.
Shed skins and eggs. Bed bugs molt five times as they grow, leaving behind hollow, honey-colored skins. Eggs are pearly white, about one millimeter long, and often stuck in clusters in crevices.
A sweet, musty odor. In heavier infestations some people notice a lingering smell, often compared to damp laundry or coriander. It is a late sign, not an early one.

Where to look

Bed bugs stay close to where people sleep, usually within a few feet of the bed. Start with the mattress and work outward. Pull back the sheets and inspect the piping and seams around the edges of the mattress and box spring, the tags, and the underside of the box spring where the dust cover can hide a crowd. Then check the headboard, bed frame joints, and screw holes. Use a flashlight and a stiff card, such as an old credit card, to scrape along seams and crevices.

If the bed is clean, move to nightstands, the gaps behind baseboards, the edges of carpeting, curtain folds, electrical outlet covers, and upholstered chairs or sofas where you rest. In heavier infestations bed bugs also turn up behind picture frames and under loose wallpaper.

Why bites alone are not enough

Itchy red welts are what make most people suspect bed bugs, but bites are a poor way to diagnose them. Reactions vary enormously: some people develop large welts, while others show no visible reaction at all. Mosquitoes, fleas, mites, and even skin conditions can look similar. Treat bites as a reason to inspect, not as proof.

Ways to confirm

Catch a specimen. Put any suspicious bug in a sealed bag or a piece of clear tape. A pest professional or your local cooperative extension office can identify it.
Use interceptor cups. These small dishes go under each bed leg and trap bugs trying to climb up or down. Check them after a week or two.
Get a professional inspection. Trained inspectors, and detection dogs in some cases, find infestations much earlier than most homeowners can.

What to do if you find them

Do not throw out your mattress or start spraying store-bought insecticides. Moving furniture around the house and using the wrong products often scatters bed bugs into new rooms and makes treatment harder. Instead, wash and dry bedding on high heat, keep the infested items where they are, and get a quote from a licensed pest control company.

Request a match with local pest control companies and compare quotes before you commit.