A “house scorpion” typically refers to one of two creatures: a true scorpion that has wandered indoors, or a tiny look-alike called a pseudoscorpion that lives permanently in homes. Which one you’re dealing with determines whether you need to worry. True scorpions can sting and cause pain, while pseudoscorpions are completely harmless and actually eat pests. Telling them apart takes about two seconds once you know what to look for.
Pseudoscorpion or True Scorpion?
The most common “house scorpion” is actually a pseudoscorpion, specifically the species Chelifer cancroides. These arachnids are tiny, only 3 to 4 millimeters long, with a teardrop-shaped body and a rich mahogany color. They have oversized pincers (more than twice the length of their legs) that extend 7 to 9 millimeters across when spread wide, giving them a crab-like appearance. The key detail: they have no tail and no stinger. Their rounded abdomen simply ends where a true scorpion’s segmented tail would begin.
True scorpions are dramatically larger, typically 2 to 4 inches long, with the unmistakable curved tail ending in a pointed stinger. If you see a tail, you’re dealing with a real scorpion. If the creature looks like a scorpion that lost its back half and could sit on your thumbnail, it’s a pseudoscorpion.
Why Pseudoscorpions Are Worth Keeping
Pseudoscorpions do have venom glands in their pincers, which they use to paralyze prey. But this venom is medically insignificant to humans. They couldn’t hurt you if they tried, and they don’t try. They’re found most often in rooms with dusty books, where they feed on booklice, dust mites, carpet beetle larvae, and other microscopic pests you’d rather not have around.
Many pest experts consider pseudoscorpions beneficial. They’re quiet, invisible most of the time, and actively reduce populations of insects that damage books, fabrics, and stored food. If you spot one, leaving it alone is a perfectly reasonable choice. They don’t reproduce in large numbers indoors, don’t build webs, and won’t infest your home the way actual pests do. If you’d rather not share space with them, gently sliding a piece of paper under the creature and placing it outside works fine.
Why True Scorpions Come Indoors
True scorpions enter homes for three reasons: water, food, and shelter. In arid regions like the American Southwest, even minor moisture sources attract them. The condensation ring under a bathroom sink, a pet’s water bowl left out overnight, or a slow drain in a guest shower each creates a water source scorpions may not find outside during dry periods. Bathrooms, laundry rooms, and kitchens see the most scorpion activity because moisture is consistent there.
Scorpions are predators, so their presence usually signals a broader pest population. If your home supports crickets, roaches, or silverfish, it can support the scorpions that hunt them. Think of a scorpion sighting as a symptom: the underlying problem is the prey insects drawing them in. Gaps around doors, windows, pipes, and wires provide entry points. Scorpions can flatten their bodies to squeeze through surprisingly narrow openings.
What a Scorpion Sting Feels Like
Most scorpion stings in the United States cause localized symptoms: intense pain at the sting site, numbness and tingling, slight swelling, and warmth. For healthy adults, this is roughly comparable to a wasp sting and resolves on its own. Washing the area with soap and water, applying a cool compress, and taking an over-the-counter pain reliever handles the majority of cases.
Serious reactions are uncommon but possible, particularly in young children and older adults. Signs of a severe reaction include trouble breathing, muscle twitching or jerking, unusual head or eye movements, drooling, sweating, slurred speech, nausea, and a rapid heart rate. If a child is stung, contact poison control immediately at 800-222-1222. Anyone experiencing difficulty breathing or symptoms lasting more than a week after a sting should seek medical attention. Previous mild reactions don’t guarantee future stings will also be mild, as anaphylaxis can develop with subsequent stings.
How to Safely Remove a Scorpion
Scorpions glow bright blue-green under ultraviolet light, making a cheap blacklight flashlight the single best tool for finding them at night. Sweep the light slowly along baseboards, walls, and corners. Once spotted, place a glass jar or cup over the scorpion, slide a stiff piece of cardboard underneath, and carry it outside. Long kitchen tongs or forceps also work well if you want more distance between your hand and the scorpion. Never reach into dark spaces, shoes, or clothing piles without checking first, especially if you live in scorpion-prone areas.
Keeping Scorpions Out
Exclusion is the most effective long-term strategy, and it starts outside the house. Clear rocks, wood piles, and yard debris that create daytime hiding spots. Prune shrubs and remove leaf litter near the foundation. These changes eliminate the staging areas scorpions use before finding their way inside.
For the house itself, seal gaps around doors, windows, pipes, vents, and wiring penetrations. Install weather stripping on exterior doors and make sure window screens fit tightly without gaps. Repair leaky faucets and air conditioning units to remove moisture that draws scorpions in. Fixing the underlying pest problem matters too. If you reduce the cricket and roach population inside your home, you remove the food source that makes your house attractive to scorpions in the first place.
Sticky glue boards placed along walls and under furniture work as a non-toxic monitoring and capture method. They won’t eliminate a scorpion population on their own, but they’ll tell you where activity is concentrated and catch individuals passively. For homes with persistent scorpion problems, a residual insecticide applied in a band around the home’s exterior perimeter and in harborage areas like attics, garages, and closets provides longer-lasting control. Insecticide dusts applied into wall voids, cracks, and around electrical fittings reach the hidden spaces where scorpions rest during the day.