Texas has two venomous spider species that pose a real health risk: the black widow and the brown recluse. While the state is home to hundreds of spider species, these are the only two considered medically significant by the Texas Department of State Health Services. Both live throughout much of the state, and both tend to hide in places where people store, stack, or rarely disturb things.
Black Widow Spiders
The southern black widow is the species found across Texas. Females are the ones to watch for: glossy black, roughly the size of a large marble including their legs, with a distinctive red hourglass marking on the underside of their round abdomen. Males are smaller, lighter in color, and rarely bite. Black widows build messy, irregular webs close to the ground in sheltered spots like woodpiles, meter boxes, outdoor furniture, garages, and the undersides of ledges or decks.
Black widows are not aggressive. Bites typically happen when someone reaches into a space where the spider is hiding and accidentally presses against it. The bite itself feels like a sharp pinch, and within an hour or two, the venom begins affecting the nervous system. Pain and cramping can spread from the bite site to the abdomen, back, or chest. Other symptoms include muscle rigidity, sweating, nausea, and elevated blood pressure. This cluster of symptoms is sometimes called latrodectism.
For healthy adults, a black widow bite is painful but rarely life-threatening. The group most at risk is older adults, who tend to have more severe reactions. Children can also develop serious symptoms because of their smaller body size. An antivenom exists and is typically given as a single injection, though it’s reserved for cases with significant symptoms because it carries a small risk of allergic reaction, particularly in people with sensitivity to horse serum. Most people recover within a few days to a week with supportive care, including pain medication and muscle relaxants.
Brown Recluse Spiders
The brown recluse is a small, tan-to-brown spider with a violin-shaped marking on the top of its body just behind the eyes. Unlike most spiders, which have eight eyes, the brown recluse has six arranged in three pairs. It’s about the size of a quarter with its legs extended. True to its name, it prefers undisturbed, dry spaces: closets, attics, boxes in storage, behind picture frames, inside shoes, and between stacked linens or clothing. Outside, it favors rock piles, woodpiles, and debris.
Brown recluse spiders are native to central and eastern Texas and become less common as you move into the western and southern parts of the state. Outside their native range, they are rare and almost exclusively found inside buildings, likely transported with boxes or furniture. Even within their range, they are reclusive and unlikely to bite unless trapped against skin, such as when you put on a shoe or shirt the spider has been hiding in.
What a Brown Recluse Bite Looks Like
Brown recluse bites have a reputation for causing dramatic, tissue-destroying wounds, but this outcome is actually uncommon. The vast majority of bites cause no symptoms or only minor irritation similar to a mosquito bite. When tissue damage does occur, it develops gradually over about two weeks. The skin around the bite turns dark, dries out, and eventually falls away, leaving an open wound that can take two to four months to fully heal. People who are overweight may develop worse tissue damage because the venom is more destructive to fat tissue with limited blood supply.
Less than 1 percent of brown recluse bites lead to body-wide complications. In rare cases, the venom can destroy red blood cells and damage the kidneys. These systemic reactions are most common in children and can become life-threatening within 12 to 36 hours, making them a true medical emergency. If a child develops dark urine, fever, or jaundice after a suspected spider bite, that warrants an immediate trip to the emergency room.
Telling the Two Apart
Black widows and brown recluses look nothing alike once you know what to check. Black widows are shiny, jet-black, and round-bodied with that red hourglass on their belly. Brown recluses are matte, light brown, and have a flattened body with long, thin legs. Black widows sit in visible webs, while brown recluses are free-roaming hunters that don’t spin catch webs. If you find a spider in a sticky, tangled web in your garage, that’s more likely a black widow. If one falls out of a cardboard box in your closet, that’s more consistent with a brown recluse.
What to Do if You’re Bitten
Clean the bite with mild soap and water right away. Apply a cool, damp cloth for about 15 minutes each hour to reduce swelling and pain, and keep the bite area elevated if possible. An over-the-counter pain reliever can help, and an antihistamine or calamine lotion can take the edge off itching. Applying a basic antibiotic ointment three times a day helps prevent secondary infection.
Seek medical care if you know or suspect the bite came from a black widow or brown recluse, if the wound is growing larger, if you see red or purple streaking around the bite, or if you develop stomach cramping, difficulty breathing, or trouble swallowing. Try to capture or photograph the spider if you can do so safely, as identification helps guide treatment. A tetanus shot may be recommended depending on your vaccination history.
Keeping Spiders Out of Your Home
Both species thrive in clutter. The single most effective prevention step is reducing the number of undisturbed hiding spots in and around your home. Store items in sealed plastic bins rather than cardboard boxes. Keep clothing, shoes, and gloves off the floor, and shake them out before putting them on, especially if they’ve been sitting in a closet, garage, or storage shed.
Seal cracks and gaps around windows, doors, and where utility lines enter the house. Install or repair door sweeps and window screens. Outside, move woodpiles, rock stacks, and yard debris away from the foundation of your home. Clear spider webs regularly, particularly in garages, sheds, and covered porches. Sticky glue traps placed along walls and in closets are an effective, low-effort way to monitor and reduce spider populations indoors.
Wear gloves when reaching into storage areas, moving firewood, or working in garden beds. This simple habit prevents the most common bite scenario for both species: accidentally pressing your hand against a spider you didn’t see.